FIEND.fm - "Hot or Not" for music discovery: 2 hrs of tracks in 2 mins
Patreon - Patreon enables fans to give ongoing support to their favorite creators.
Music Suggestions Ninja - Enter an artist's name & find similar, lesser known artists
Level Music - A new platform for independent artists, everywhere. In beta.
RYSE UP - Connecting up-and-coming artists with the world's top talent
Apple - Available on iOS