To stop music do Cromox's suggestion and when adding music, be careful you might confuse Music with Sounds so here is a bit explanation:
Sound: Plays your sound and when it ends, it will not loop anymore. To play a sound:
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Sound - Play >>Your sound here<<
Music: Plays your music and it will loop making it endless and also replaces the BGM being played by the game, only by triggers it can be stopped. To play a music, same with the format of Music but dont confuse them for they are DIFFERENT TRIGGERS:
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Sound - Play >>Your music here<<