Music? Music. As soon as they catch the sound Frisk is there, nevermind that they were a floor and several halls away before and end up panting a little bit when they get to the doorway.

And then they freeze, because--a part of them expected somebody new, 'cause nobody they know here could play something that involved, but...

...they'd met a Gaster once. Almost a year ago. And they've got...mixed feelings about him, or at least some versions of him thanks to the lab their brothers came from. But that might not...be this one.

Anyway--they're not going to interrupt until he's done. The songs are somehow nostalgic, and they're definitely nice to listen to.