Amazon has made its Music Skill API generally available in the Alexa Skills Kit. This API is meant for music service providers, such as Spotify or Pandora, and allows them to add their music service to Alexa-powered devices. Once connected, subscribers will be able to ask for their tunes by voice.
Spotify subscribers who also use Apple products may soon be able to use Siri to interact with the popular music service. Spotify is taking advantage of the SiriKit audio API, which was recently made available via iOS 13, to test the integration. It's not a done deal, but iPhone owners can dream.