It simple find a strip and try to put music to it.

Example:
The end of imaginate too with this music

Also Imaginate with music A or music B

The first one I can totally hear being in the comic, expect when Peanut goes blank, then the music stops comedically. XD

Fido Returns with The unofficial theme of the dogs

http://www.youtube.com/watch?v=fQoQtwJHu8Q
I found this video for Biology class and thought that the music was good maybe going to have a mystical or creepy strip. Just listen to the music but don't pay any attention to the video b/c it has nothing to do with the comic.