void init_music();
==== play_song ====
void play_song(const unsigned char* song, char bank_num, char loop);
==== tick_music ====
char tick_music();
==== play_sound_effect ====
void play_sound_effect(char* sfx_ptr, char sfx_bank, char priority);
==== stop_music ====
void stop_music();
==== pause_music ====
void pause_music();
==== unpause_music ====
void unpause_music();