Talk:Undertale Soundtrack/@comment-24071628-20151028062146/@comment-4566760-20151116070254

I'm pretty sure silence.ogg is actually used, in places with no music.

House2 is used in-game when the lights are turned off in your room in Toriel's house.

grandpasemi.ogg is the intro to Mettaton's theme, but slower and with different instruments.

bad.ogg, from what I remember, is used when Mettaton's about to kill you with a chainsaw in Cooking with a Chef Robot, and when the bomb's about to explode in his news report.