I am know for having parties, and like most people I use spotify for all of them, as I feel its much easier than other alteratives. However, playing the great music Spotify has to offer is a lot harder than you would expect. I dont have sonos in my house, just speakers, however just playing music through means it isn't as loud as you would want for a party as once people fill up certain rooms it quitens the music. It also means that it is harder to get music through to all of the rooms.
I thought to solve this issue, it would be so great to be able to play your music at the same time, on multiple devices. So I could use my phone, iPod and mac connected to three different speakers throughout my house and the music can just flow and the party can boogy more. I know you can download your playlists on up to three devices, which I think is the perfect amount for a party.
I feel like this would help so many people make their parties even better.