The Air has Spotify Connect integrated to into it as a streaming service. Details on how to use Spotify Connect can be found here.
However, the Air also plays music from any Bluetooth or AirPlay device. This means it can play back any Streaming Service that is sent to it by the source (Bluetooth or Airplay) device. For example, if your phone or laptop has Pandora running on it, then the audio can be sent and played back through the Air.