Alexa can play music from most streaming services, like Apple Music, Spotify, SiriusXM, Audible, iHeart Radio, Pandora, and more.
Connect supported music streaming services to Alexa by opening the Amazon Alexa app and 1) Tapping the menu icon in the upper left corner, 2) Tapping Settings, 3) Tapping Music & Podcasts, 3) Choosing Link New Service. You can also choose a default service.
Note, Prime members and Amazon Music Unlimited subscribers can still get these services to play when they aren't the default music service. Just add "... on Amazon" to the end of your Alexa request. Try asking: