In response to the numerous missing music posts, I've paraphrased this from Spotify's music FAQs.
Spotify wants all the world’s music to be available in all countries. However, some artists and tracks are not currently available. Sometimes agreements can’t be reached with the artist or label or a change may happen in music ownership.
Thousands of albums and artists are being added to Spotify every day. If you can’t find an artist you’re looking for, they may appear (or reappear) soon.
In the meantime, feel free to contact the artist or their label to ask when they plan to be on Spotify.
You can also open this form and provide Spotify with feedback.
When doing so, do please keep in mind that this is an internal list they will use at regular intervals, to see how much interest there is for any given band. Submitting a name does not mean they will magically be showing up soon.