Need help? Check out Spotify Answers for solutions to a wide range of topics.
For Example: Kid ink - That's how you know (Enthic Remix)
Someone has requested an idea for a 'Wish Box' where you can request music, you can find that here:
Spotify tries really hard to get music available on their service, but in the end the availability of music on Spotify is up to the artist and their music label.This thread by Spotify staff explains why some music is not available:https://community.spotify.com/t5/Content-Questions/I-want-an-artist-song-on-Spotify/td-p/1136005