I can attest to the staying power of Empire's jingle here in Chicagoland. Especially their phone number, included in the jingle here. That, and (see if you can complete it in your head, Chicagoans): 773-202-

And the jingle for the Kars for Kids charity is the sort of ear worm that makes me change the station when I hear the first strum of the guitar accompaniment, but it's done its job and gotten stuck in my head. "1-877-KARS 4 KIDS; K A R S, Kars for Kids".

Jingles work for the audience who hears them. Plenty still listen to radio on their commutes.