Confirmed artist: Garrett Freireich
Incorrect Title: I'm Not Coming In Anymore
Misattributed To: Stuart Hill, They Might Be Giants
From a comment posted to YouTube by Stuart Hill:
Okay, for the last time, They Might Be Giants did not do this song. And I have no band. These were studio musicians put together by the late Eddie Horst, a very talented producer and friend of mine. We recorded it at Doppler Studios in Atlanta. I was the writer of this song, along with several other projects for Cartoon Network when I was there from 1998 to 2006. I've heard so many "definitive" answers about who did this and who didn't do this, only a small percentage of which are accurate. I'm flattered beyond imagination that people think They Might Be Giants did this. But they did not. Any official Cartoon Network pages including this song will tell you the same, as will anyone you contact at Cartoon Network.