Get rid of amateur cover versions.
Before we joined Spotify, we had no idea there were so many cover bands out there. And before Spotify, we never realized how annoying they could be.
Our natural assumption was that they were originally added as a way to supplement the library because it doesn't have legendary bands like Pink Floyd and Led Zeppelin due to licensing issues. But if you're really itching to listen to Dark Side of the Moon who in their right mind would settle for Pink Project JB Production's A Tribute to Pink Floyd? Worse yet, who listens to the Mac Miller Karaoke Band? Especially when Spotify already has Mac Miller's actual album.
All the cover bands are pointless. They don't supplement Spotify's library, they clutter it. Get rid of them.