Many folks in the Community have requested certain tracks, albums or artists be added to Spotify. The reality is that we would like to have all the world's music available on Spotify.
Therefore, anything which we have the right to upload and has been provided to us, should be available on Spotify. We are signing new labels and working hard to add music every week. Hopefully your favorite music will be up soon.
Keep in mind availability can vary over time and between countries, depending on agreements between Spotify and rights holders, such as artists or record labels.
If you'd like to discuss the artists you'd like to see with other Spotify users you can do so in this board.