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 –

The Classic TV Archive http://ctva.biz/index.htm
BBC Genome Project https://genome.ch.bbc.co.uk/
Vintage Rock TV Archive https://sites.google.com/site/vintagerocktv/
TV Pop Diaries. Popular Music on British Television http://www.tvpopdiaries.co.uk/index.html
TV.com http://www.tv.com/
Internet Movie Database https://www.imdb.com/
Rock On Television Encyclopaedia http://hardprog.pagesperso-orange.fr/rock_on_television__1306.htm
Jazzonfilm.com http://www.jazzonfilm.com/index.html
Jazz On The Screen http://memory.loc.gov/diglib/ihas/html/jots/jazzscreen-home.html
Historic Films http://www.historicfilms.com/tapes/628
The Beatles Bible https://www.beatlesbible.com/
Peterchecksfield.com http://www.peterchecksfield.com

And not forgetting –

Wikipedia https://en.wikipedia.org/wiki/Main_Page
Google https://www.google.com/

BOOKS

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)