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Actually, I believe they are using Vorbis, not mp3 encoding.

• yungchin 16y ago
  Right, that is the key to the issue I think: Spotify can't just include an MP3 decoder, unless they pay licensing fees to Thomson or Fraunhofer or whoever it was. On Windows/Mac, I guess they instead rely on the system-wide codec, but on Linux there would be some diversity in the implementations, and so probably they chose not to bother, for now.