Another find via Reddit: a database covering popular music in movies and television from the 1920s to 1981. It’s called Lights, Camera Backbeat. From the About page: “LCB starts at the beginning of synchronised sound and film with early Vitaphone and Phonofilm musical shorts in the 1920’s and continues up to the birth of MTV in 1981. The 1980’s launched a new era in music on film with a massive increase in music videos produced for TV use as well as home video product on VCR and Betamax. Prior to 1981 there were often only limited chances to see major pop music performers on TV and in the cinema, particularly if you lived outside the USA.” I did a couple of quick searches; the database did not contain Paul Anka’s performances in GIRLS TOWN and did not contain Mamie Van Doren’s songs from UNTAMED YOUTH. So lots of results, but nowhere near complete.