https://techcrunch.com/2017/09/26/amazon-adds-alexa-voice-control-to-the-amazon-music-app/

Amazon today is bringing Alexa to the Amazon Music app on iOS and Android, allowing listeners to use voice controls with their music. The feature is available in the U.S., U.K., Germany and Australia, the company says, and will let users do things like request a song, artist, or music for various activities or moods, like “road trips” or “running,” – the same as you can do with Alexa on Echo speakers.

You can also ask Alexa to play songs where you don’t know the name of the track, but only the lyrics – another option Echo owners have had for some time.