Scrubs - Season 1, Episode 23: Soundtracks

Not really a song, but the Todd sings to himself right after Turk realizes the Todd is a better surgeon than him.

Ted introduces the other members of his a capella group and they sing this song together.

Elevator scene

A rotating split-screen depicts the resolve to change.

It's not exactly a song, but Turk sings to himself for two-three seconds during J.D.'s wrap-up narrative at the end of the episode.

A rotating split-screen depicts the resolve to change.

Ted and his band practice their renditions of cartoon theme songs.