Parry Gripp, Commercial Jingles, & Other Good Music

What ever happened to commercial jingles?  When I was growing up, it seemed to me that most products had their own theme songs: “My bologna has a first name — it’s O-s-c-a-r,” “Plop, plop, fizz, fizz,” “Hershey is the great American chocolate bar,” “What walks downstairs, alone or in pairs, and makes such a slinkety…