https://www.cnbc.com/2017/12/13/amazon-echo-multi-room-music-now-supports-spotify.html

The Amazon Echo now allows users play Spotify and SiriusXM on different Echos around their homes.

Amazon rolled out the multi-room music feature earlier this year, which lets users play the same song on different Echo units placed around their homes. That feature was limited to Amazon Music Unlimited, TuneIn, iHeartRadio and Pandora, however. Which means it wasn't as capable as the Google Home or Sonos speakers for folks who subscribe to Spotify.