If you want to find something uncommon on the most popular music subscription service Spotify, you may try Forgotify.
There are about 4 millions songs on Spotify, which have never been played. These 20% of songs listed at Spotify are made accessible by forgotify. The service indeed claims to play just songs that never have been heard. This experience probably is unsual, but might be interesting as well. So if you like to discover something new, give it a try: Forgotify.
TRAEXS Directory Links: Music Sharing