* had high quality streams
* had gigantic library
* _biggest of all_ cracked the 'discovery' nut.
I listen to music all day, I don't like to listen to the same tracks more than a few times so I have a hard time keeping my queue full.
I'm a Spotify subscriber so I'll find an artist I think is interesting, play their whole discography and then start digging into 'related artists' to find new stuff.
This is a bit of a drag and is hit or miss. I don't necessarily want to find related music, but music that I might like. Spotify's radio feature is just about useless. Voting one way or the other will skew it to play pretty much _only_ the thumbs up'ed artist or avoid a genre entirely if you thumbs down a particular track.
I still think there is a killer music service waiting to be born. I don't think Tidal will be it.