Spotify does its very best to stream all the great music out there. Many people, including myself have found frustration with this occurrence. What may happen is that artists who have disagreements with their record labels, or have other varying reasons, may decide to remove songs from Spotify. In the meantime, you could try to get in contact with the artists or recording label (if possible) to ask why the song(s) was removed. The song(s) could also reappear in the future.
Hope this helps!
A_MusicophileRising Star 19
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