Spotify isnt profitable quite yet, but with 10 million paid subscribers, the company is likely closer than anyone else in the on-demand music space to breaking even. You could attribute the companys success to a variety of things, from its extensive music collection to its fleet of apps for almost every platform, but I think another side of Spotifys business deserves a bit more credit: the increasing number of apps, gadgets, services, and even cars that plug directly into Spotify. The latest is a hard-wired integration with Djay, one of the most popular DJ-ing apps, which lets you stream two tracks from Spotify simultaneously and mix between them in real-time. The integration gives DJs access to a library of 20 million tracks, where before, they would have only had access to their local iTunes library or to a crate of vinyls.