Lights Camera Backbeat (LCB) draws information from here, there and everywhere to add details of films and clips. This includes info supplied with the clips themselves as posted on the internet and with commercial DVDs.
Some especially useful info sources for vintage music on film are –
A Song In The Dark, The Birth Of The Musical Film – Richard Barrios (OUP)
African-American Blues, Rhythm and Blues, Gospel and Zydeco on Film and Video, 1926-1997 – Paul Vernon (Ashgate)
Jazz In The Movies – David Meeker (Talisman)
The British Musical Film – John Mundy (Manchester University Press)
The First Hollywood Musicals – Edwin M. Bradley (McFarland)
The Soundies Book – Scott MacGillivray and Ted Okuda (iUniverse)
A guide to cool and classic clips from the dawn of Talkies to the birth of MTV.