Talk:Undertale Soundtrack/@comment-27524978-20160114013345/@comment-27617802-20160115235147

C:\Program Files (x86)\Steam\steamapps\common\Undertale

This will perhaps vary if you are not using Windows 7, etc, but yeah, its in Steam>steamapps>common>Undertale (folder) in there you will find the game and the soundtrack. You can then drag the soundtrack folder somewhere more convenient.