That's amazingly comprehensive! I actually bought some musicoin and really hope it will kick off one day. I just found the user interface to be a bit tricky and not intuitive.
Totally agree with the Steemit part, especially now with DSound, you can easily share your music and listen to other talented steemians. Also it's easy to use, especially for those who've been on SoundCloud for a while :)
Yea musicoin's interface right now is just frankly 💩💩💩💩 i hope they make it better soon