Add songs from Soundcloud
Brandon Giesing commented
In addition to SoundCloud, I think YouTube would be another big one to add as there's lots of songs only on YouTube by smaller artists and artists who might not be able to sell in one of those stores (not in a supported country for instance).
Also not as big compared to those two, but Amazon Music, Tidal, Bandcamp, and other music stores could be integrated also down the line.
Yes, but where they show album art instead of a link.