Public Domain Information Project https://www.pdinfo.com/
Art List https://artlist.io/
Music Vine https://musicvine.com/
MusicBed https://www.musicbed.com/
SoundStripe https://soundstripe.com/
digccmixter http://dig.ccmixter.org/
Free Music Archive https://www.freemusicarchive.
Sound Cloud https://soundcloud.com/
Bandcamp https://bandcamp.com/