The mini profiles now have an option to add music to them. For the music use this site here:
kiwi6.com/The "direct hotlink" for the songs is the url that should be added to the profiles.
This site doesn't have the widest variety, but it's the only one I know of that works for the mini profiles.
If you find another site that works too and has a better selection, please let us know here. <3