I already got help, for to make it play: https://scriptinghelpers.org/questions/41560/This-is-a-link
So when a player click a part the music that is playing just stops? Like if you click the a part it plays and when you click the other part it stop the music playing! Not all the music only one part.
If the sound is already playing, you can stop the sound by using:
script.Parent.Sound:Pause() --Change script.Parent.Sound to where the sound is
or,
script.Parent.Sound.Playing = false --Change script.Parent.Sound to where the sound is
or, if you want to stop the sound completely, use
script.Parent.Sound:Stop() --Change script.Parent.Sound to where the sound is