Sonos - multiple streams

[darrancummins]

Hi all,

I know that Spotify will play multiple streams simultaneously to a Sonos system, so that there can be different music playing in each Sonos zone, (from a single Spotify Premium acount) - what is the maximum number of simultaneous streams available? 

And is this feature available on any other multi-room system, e.g. Yamaha MusicCast, ChromeCast etc?

Thanks,

Darran