Sing, Sing A Song

At the end of The Simpsons last night (a weak, unfocused episode), Homer suggests to Bart they go driving while he sings public domain songs. This in-joke might have worked better if the episode hadn't already used "Powerhouse," The Allman Brothers' "Jessica," War's "Cisco Kid," Bill Haley's "Rock Around The Clock" and an instrumental of "Stranger In Paradise."

Or was that the point? They were already tapped out paying for those.