@jcsnv spotify don't allow use of their music for commercial purposes or re-broadcasting (its for personal use only) as part of their end user agreement. So although it might be possible for us to integrate it, they won't allow it long term as it currently stands.
Radio.co is a project we have been working on for about the last year or so. Our aim is to make broadcasting as easy as possible for people. It's built using a combination of Backbone on the front end, PHP on the back end and Node to manage the servers.
Cuedle
MatchMaker.fm
businesscards.io
MatchMaker.fm