It's called Multi-Room Music and the new feature enables several Echo smart speakers to stream music in sync across the home.
I gave the beta Sonos Android app a spin on my Nexus 5 and came away impressed. Universal search is a welcome addition and the new look is clean and modern.
Why the big deal? It means you can stream tracks without the need for a server or host PC.
Songza, I discovered, is a startup in New York City whose staff includes software engineers, and music experts... and what any self-respecting startup also considers core to the business: "absurdly talented dancers."