Songs used to boost appeal of commercials.
Ira Antelis couldn't become a music star so he switched to advertising.
These days he likes to use popular music in commercials.
I don't know how you feel, but lately when a car commercial comes on TV with a popular song as the music, I get turned off.
I'd prefer that they create some new music or use something that I haven't heard before.
UPDATE: AdTunes.com has a database of TV Commercial music and more.