What follows are a set of links to sites that offer free music on the Creative Commons license. There are lots of others but these in particular point to pages of out-of copyright recordings. I know most of you prefer the 50s and 60s but this is generally older stuff.
https://freemusicarchive.org/music/Antique_Phonograph_Music_Program_Various_Artists/
https://www.archive.org/search.php?query=collection:78rpm&sort=-publicdate
the latter is better searched through as a lot of the stuff is in single tracks. There are whole albums of material from the same artist and they have some films too. There is post-50s material as well either in the live archive or other collections although the other collections are generally more obscure acts. This is a link to their feature film collection https://www.archive.org/details/feature_films
This next one is from a site that gives out free stuff for kids. https://www.kazoomzoom.com/music/kzz003 is a collection of old ragtime piano rolls.
https://freemusicarchive.org/music/Antique_Phonograph_Music_Program_Various_Artists/
https://www.archive.org/search.php?query=collection:78rpm&sort=-publicdate
the latter is better searched through as a lot of the stuff is in single tracks. There are whole albums of material from the same artist and they have some films too. There is post-50s material as well either in the live archive or other collections although the other collections are generally more obscure acts. This is a link to their feature film collection https://www.archive.org/details/feature_films
This next one is from a site that gives out free stuff for kids. https://www.kazoomzoom.com/music/kzz003 is a collection of old ragtime piano rolls.