You don't add something at ID_music.py, that file gets overwritten everytime the module system gets compiled.
I added all the tracks again and I'm still getting the same error.
my module_music.py:
("arena_6", "ext_ambushed_by_khergit.mp3", mtf_module_track|mtf_looping|mtf_sit_arena, 0), # 90,5 dB
("brytenwalda_title_screen", "brytenwalda_title_screen.ogg", mtf_module_track|mtf_sit_main_title|mtf_start_immediately, 0),
("brytenwalda_capture", "brytenwalda_capture.ogg", mtf_module_track|mtf_persist_until_finished, 0),
("brytenwalda_defeated_by_neutral", "brytenwalda_defeated_by_neutral.ogg",mtf_module_track|mtf_sit_killed, 0),
("brytenwalda_defeated_by_neutral_2", "brytenwalda_defeated_by_neutral_2.ogg", mtf_module_track|mtf_sit_killed, 0),
("brytenwalda_defeated_by_neutral_3", "brytenwalda_defeated_by_neutral_3.ogg", mtf_module_track|mtf_sit_killed, 0),
("brytenwalda_c2", "brytenwalda_c2.ogg", mtf_module_track|mtf_persist_until_finished, 0),
("brytenwalda_c9", "brytenwalda_c9.ogg", mtf_module_track|mtf_persist_until_finished, 0),
("brytenwalda_c105", "brytenwalda_c105.ogg", mtf_module_track|mtf_persist_until_finished, 0),
("brytenwalda_empty_village", "brytenwalda_empty_village.ogg", mtf_module_track|mtf_persist_until_finished, 0),
("brytenwalda_encounter_hostile_nords", "brytenwalda_encounter_hostile_nords.ogg", mtf_module_track|mtf_persist_until_finished|mtf_sit_encounter_hostile, 0),
("brytenwalda_escape", "brytenwalda_escape.ogg", mtf_module_track|mtf_persist_until_finished, 0),
("brytenwalda_outdoor_beautiful_land", "brytenwalda_outdoor_beautiful_land.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_night|mtf_sit_tavern),
("brytenwalda_killed_by_khergit", "brytenwalda_killed_by_khergit.ogg", mtf_module_track|mtf_persist_until_finished|mtf_culture_3|mtf_sit_killed, 0),
("brytenwalda_killed_by_swadian", "brytenwalda_killed_by_swadian.ogg", mtf_module_track|mtf_persist_until_finished|mtf_culture_1|mtf_sit_killed, 0),
("brytenwalda_lords_hall_khergit", "brytenwalda_lords_hall_khergit.ogg", mtf_module_track|mtf_culture_3|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern|mtf_culture_all),
("brytenwalda_lords_hall_nord", "brytenwalda_lords_hall_nord.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("brytenwalda_lords_hall_swadian", "brytenwalda_lords_hall_swadian.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("brytenwalda_lords_hall_rhodok", "brytenwalda_lords_hall_rhodok.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("brytenwalda_lords_hall_vaegir", "brytenwalda_lords_hall_vaegir.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("brytenwalda_retreat", "brytenwalda_retreat.ogg", mtf_module_track|mtf_persist_until_finished|mtf_sit_killed, 0),
("brytenwalda_town_neutral", "brytenwalda_town_neutral.ogg", mtf_module_track|mtf_sit_town|mtf_sit_travel, mtf_sit_tavern|mtf_sit_night),
("brytenwalda_town_khergit", "brytenwalda_town_khergit.ogg", mtf_module_track|mtf_culture_3|mtf_sit_town|mtf_sit_travel, mtf_sit_tavern|mtf_sit_night|mtf_culture_all),
("brytenwalda_town_nord", "brytenwalda_town_nord.ogg", mtf_module_track|mtf_culture_4|mtf_sit_town|mtf_sit_travel, mtf_sit_tavern|mtf_sit_night|mtf_culture_all),
("brytenwalda_town_rhodok", "brytenwalda_town_rhodok.ogg", mtf_module_track|mtf_culture_5|mtf_sit_town|mtf_sit_travel, mtf_sit_tavern|mtf_sit_night|mtf_culture_all),
("brytenwalda_town_swadian", "brytenwalda_town_swadian.ogg", mtf_module_track|mtf_culture_1|mtf_sit_town|mtf_sit_travel, mtf_sit_tavern|mtf_sit_night|mtf_culture_all),
("brytenwalda_town_vaegir", "brytenwalda_town_vaegir.ogg", mtf_module_track|mtf_culture_2|mtf_sit_town|mtf_sit_travel, mtf_sit_tavern|mtf_sit_night|mtf_culture_all),
("brytenwalda_travel_khergit", "brytenwalda_travel_khergit.ogg", mtf_module_track|mtf_culture_3|mtf_sit_travel, mtf_sit_town|mtf_sit_tavern|mtf_sit_night|mtf_culture_all),
("brytenwalda_travel_neutral", "brytenwalda_travel_neutral.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_tavern|mtf_sit_night),
("brytenwalda_travel_nord", "brytenwalda_travel_nord.ogg", mtf_module_track|mtf_culture_4|mtf_sit_travel, mtf_sit_town|mtf_sit_tavern|mtf_sit_night|mtf_culture_all),
("brytenwalda_travel_rhodok", "brytenwalda_travel_rhodok.ogg", mtf_module_track|mtf_culture_5|mtf_sit_travel, mtf_sit_town|mtf_sit_tavern|mtf_sit_night|mtf_culture_all),
("brytenwalda_travel_swadian", "brytenwalda_travel_swadian.ogg", mtf_module_track|mtf_culture_1|mtf_sit_travel, mtf_sit_town|mtf_sit_tavern|mtf_sit_night|mtf_culture_all),
("brytenwalda_travel_vaegir", "brytenwalda_travel_vaegir.ogg", mtf_module_track|mtf_culture_2|mtf_sit_travel, mtf_sit_town|mtf_sit_tavern|mtf_sit_night|mtf_culture_all),
("brytenwalda_travel_sarranid", "brytenwalda_middle_eastern_travel.ogg", mtf_culture_6|mtf_sit_travel, mtf_sit_town|mtf_sit_tavern|mtf_sit_night|mtf_culture_all),
("brytenwalda_ambushed_by_sarranid", "brytenwalda_middle_eastern_action.ogg", mtf_module_track|mtf_culture_6|mtf_sit_ambushed|mtf_sit_siege, mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_culture_all),
("brytenwalda_uncertain_homestead", "brytenwalda_uncertain_homestead.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("brytenwalda_hearth_and_brotherhood", "brytenwalda_hearth_and_brotherhood.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("brytenwalda_tragic_village", "brytenwalda_tragic_village.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("brytenwalda_victorious_evil", "brytenwalda_victorious_evil.ogg", mtf_module_track|mtf_persist_until_finished, 0),
("brytenwalda_victorious_neutral_1", "brytenwalda_victorious_neutral_1.ogg", mtf_module_track|mtf_sit_victorious, 0),
("brytenwalda_victorious_neutral_2", "brytenwalda_victorious_neutral_2.ogg", mtf_module_track|mtf_sit_victorious, 0),
("brytenwalda_victorious_neutral_3", "brytenwalda_victorious_neutral_3.ogg", mtf_module_track|mtf_sit_victorious, 0),
("brytenwalda_victorious_swadian", "brytenwalda_victorious_swadian.ogg", mtf_module_track|mtf_culture_2|mtf_sit_victorious, 0),
("brytenwalda_victorious_vaegir", "brytenwalda_victorious_vaegir.ogg", mtf_module_track|mtf_culture_2|mtf_sit_victorious, 0),
("brytenwalda_victorious_vaegir_2", "brytenwalda_victorious_vaegir_2.ogg", mtf_module_track|mtf_culture_2|mtf_sit_victorious, 0)
("glorian_sword_faith_1", "glorian_sword_faith_1.ogg", mtf_module_track|mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed, 0),
("glorian_lost_battle_2", "glorian_lost_battle_2.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("glorian_bards_tale_3", "glorian_bards_tale_3.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("glorian_handefull_of_sorrow_4", "glorian_handefull_of_sorrow_4.ogg", mtf_module_track|mtf_culture_6|mtf_sit_travel, mtf_sit_town|mtf_sit_tavern|mtf_sit_night|mtf_culture_all),
("glorian_where_my_heart_is_5", "glorian_where_my_heart_is_5.ogg", mtf_module_track|mtf_sit_feast|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_night|mtf_sit_tavern),
("glorian_castle_dance_6", "glorian_castle_dance_6.ogg", mtf_module_track|mtf_sit_feast|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_night|mtf_sit_tavern),
("glorian_knights_fall_7", "glorian_knights_fall_7.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("glorian_dove_in_the_sky_8", "glorian_dove_in_the_sky_8.ogg", mtf_module_track|mtf_sit_feast|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_night|mtf_sit_tavern),
("glorian_echo_in_eternity_9", "glorian_echo_in_eternity_9.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_night|mtf_sit_tavern),
("glorian_pride_or_pain_10", "glorian_pride_or_pain_10.ogg", mtf_module_track|mtf_sit_siege, mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed),
("glorian_first_battle_11", "glorian_first_battle_11.ogg", mtf_module_track|mtf_sit_siege, mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed),
("glorian_the_die_is_cast_12", "glorian_the_die_is_cast_12.ogg", mtf_module_track|mtf_sit_siege, mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed),
("glorian_march_on_honor_13", "glorian_march_on_honor_13.ogg", mtf_module_track|mtf_sit_siege, mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed),
("glorian_crusade_14", "glorian_crusade_14.ogg", mtf_module_track|mtf_sit_siege, mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed),
("glorian_vultures_lair_15", "glorian_vultures_lair_15.ogg", mtf_module_track|mtf_sit_siege, mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed),
("glorian_last_fortress_16", "glorian_last_fortress_16.ogg", mtf_module_track|mtf_sit_siege, mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed),
("glorian_desert_flavours_17", "glorian_desert_flavours_17.ogg", mtf_module_track|mtf_culture_6|mtf_sit_travel, mtf_sit_town|mtf_sit_tavern|mtf_sit_night|mtf_culture_all),
("glorian_knights_of_honour_18", "glorian_knights_of_honour_18.ogg", mtf_module_track|mtf_persist_until_finished),
("glorian_the_7th_horn", "glorian_the_7th_horn.ogg", mtf_module_track|mtf_sit_siege, mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed),
("michael_ferenci_a_losing_battle", "michael_ferenci_a_losing_battle.ogg", mtf_module_track|mtf_sit_fight|mtf_sit_ambushed, 0),
("michael_ferenci_ambushed", "michael_ferenci_ambushed.ogg", mtf_module_track|mtf_sit_ambushed|mtf_sit_siege, mtf_sit_fight|mtf_sit_multiplayer_fight),
("michael_ferenci_reluctant_hero", "michael_ferenci_reluctant_hero.ogg", mtf_module_track|mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed, 0),
("michael_ferenci_requiem", "michael_ferenci_requiem.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("michael_ferenci_silent_intruder", "michael_ferenci_silent_intruder.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("michael_ferenci_the_great_hall", "michael_ferenci_the_great_hall.ogg", mtf_module_track|mtf_persist_until_finished|mtf_sit_victorious, 0),
("michael_ferenci_the_pilgrimage", "michael_ferenci_the_pilgrimage.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("michael_ferenci_the_triumph", "michael_ferenci_the_triumph.ogg", mtf_module_track|mtf_sit_siege, mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed),
("rejenorst_hammer_of_war", "rejenorst_hammer_of_war.ogg", mtf_module_track|mtf_sit_siege, mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed),
("rejenorst_in_nomine_rex", "rejenorst_in_nomine_rex.ogg", mtf_module_track|mtf_persist_until_finished|mtf_culture_1|mtf_sit_victorious, 0),
("rejenorst_jamaican_rum", "rejenorst_jamaican_rum.ogg", mtf_module_track|mtf_sit_travel, mtf_sit_town|mtf_sit_night|mtf_sit_tavern),
("rejenorst_mideastbeat", "rejenorst_mideastbeat.ogg", mtf_module_track|mtf_culture_6|mtf_sit_siege, mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed, mtf_culture_all),
("rejenorst_victoris", "rejenorst_victoris.ogg", mtf_module_track|mtf_culture_1|mtf_sit_fight|mtf_sit_multiplayer_fight|mtf_sit_ambushed, mtf_culture_all),
]
my id_music.py:
track_arena_6 = 183
track_brytenwalda_title_screen = 184
track_brytenwalda_capture = 185
track_brytenwalda_defeated_by_neutral = 186
track_brytenwalda_defeated_by_neutral_2 = 187
track_brytenwalda_defeated_by_neutral_3 = 188
track_brytenwalda_c2 = 189
track_brytenwalda_c9 = 190
track_brytenwalda_c105 = 191
track_brytenwalda_empty_village = 192
track_brytenwalda_escape = 193
track_brytenwalda_outdoor_beautiful_land = 194
track_brytenwalda_killed_by_khergit = 195
track_brytenwalda_killed_by_swadian = 196
track_brytenwalda_lords_hall_khergit = 197
track_brytenwalda_lords_hall_nord = 198
track_brytenwalda_lords_hall_swadian = 199
track_brytenwalda_lords_hall_rhodok = 200
track_brytenwalda_lords_hall_vaegir = 201
track_brytenwalda_retreat = 202
track_brytenwalda_town_neutral = 203
track_brytenwalda_town_khergit = 204
track_brytenwalda_town_nord = 205
track_brytenwalda_town_rhodok = 206
track_brytenwalda_town_swadian = 207
track_brytenwalda_town_vaegir = 208
track_brytenwalda_travel_khergit = 209
track_brytenwalda_travel_neutral = 210
track_brytenwalda_travel_nord = 211
track_brytenwalda_travel_rhodok = 212
track_brytenwalda_travel_swadian = 213
track_brytenwalda_travel_vaegir = 214
track_brytenwalda_travel_sarranid = 215
track_brytenwalda_ambushed_by_sarranid = 216
track_brytenwalda_uncertain_homestead = 217
track_brytenwalda_hearth_and_brotherhood = 218
track_brytenwalda_tragic_village = 219
track_brytenwalda_victorious_evil = 220
track_brytenwalda_victorious_neutral_1 = 221
track_brytenwalda_victorious_neutral_2 = 222
track_brytenwalda_victorious_neutral_3 = 223
track_brytenwalda_victorious_swadian = 224
track_brytenwalda_victorious_vaegir = 225
track_brytenwalda_victorious_vaegir_2 = 226
track_glorian_sword_faith_1 = 227
track_glorian_lost_battle_2 = 228
track_glorian_bards_tale_3 = 229
track_glorian_handefull_of_sorrow_4 = 230
track_glorian_where_my_heart_is_5 = 231
track_glorian_castle_dance_6 = 232
track_glorian_knights_fall_7 = 233
track_glorian_dove_in_the_sky_8 = 234
track_glorian_echo_in_eternity_9 = 235
track_glorian_pride_or_pain_10 = 236
track_glorian_first_battle_11 = 237
track_glorian_the_die_is_cast_12 = 238
track_glorian_march_on_honor_13 = 239
track_glorian_crusade_14 = 240
track_glorian_vultures_lair_15 = 241
track_glorian_last_fortress_16 = 242
track_glorian_desert_flavours_17 = 243
track_glorian_knights_of_honour_18 = 244
track_glorian_the_7th_horn = 245
track_michael_ferenci_a_losing_battle = 246
track_michael_ferenci_ambushed = 247
track_michael_ferenci_reluctant_hero = 248
track_michael_ferenci_requiem = 249
track_michael_ferenci_silent_intruder = 250
track_michael_ferenci_the_great_hall = 251
track_michael_ferenci_the_pilgrimage = 252
track_michael_ferenci_the_triumph = 253
track_rejenorst_hammer_of_war = 254
track_rejenorst_in_nomine_rex = 255
track_rejenorst_jamaican_rum = 256
track_rejenorst_mideastbeat = 257
track_rejenorst_victoris = 258