Through the Alexa App, users can create groups of speakers -- like, for example, all of the speakers in the upstairs rooms of your house -- then when you want to hear music just through those devices, you'll just have to say, "Alexa, play Kesha upstairs." For now, this capability is offered with Amazon Music, TuneIn, iHeartRadio and Pandora. Spotify and SiriusXM support is on the way.

Along with the new Alexa capability, Amazon will make tools available later this year that will allow developers to enable standalone Alexa-enabled devices to integrate with the new multiroom skill. So, users with Echo devices and other Alexa-enabled speakers will be able to use them together to play music.

Other systems like Google Home and Sonos already have these multiroom capabilities, but Amazon announced an additional feature in the works that paints the Echo as more of an accompanying device rather than just a competitor. Amazon's new Connected Speaker APIs will allow other audio systems to be controlled by Alexa. The company said it's already working with Sonos, Bose, Sound United and Samsung on the upcoming capability, which would let users control connected Sonos speakers through their Echo Dot, for example.

In a statement, Sound United CEO Kevin Duffy said, "Soon, users will be able to play their favorite song, alter the volume, or change an input in any room where our connected products are placed, simply by asking Alexa to do so."