I've heard of some people using Musicoin, but honestly have not looked too closely at it myself. Another one that I think does something similar is Ujo Music, I look forward to their alpha launch.
I dunno if you can call some of the other ones "competitors," they probably do different things. DotBC is one that wants to introduce a new blockchain codec (.bc files), while LBRY is building a sort of open source YouTube, while BitTunes has an iTunes-esque app built on bitcoin...
There are so many! Out of all of them, I think that LBRY and Steem have the best long-term potential right now to create new monetization opportunities in the music industry.
I will have a look into LBRY thank you for the advice =)