According to the company, this had been the most-requested feature among its "hundreds of thousands" of users. And for good reason: SoundCloud might be a big name in music streaming, but it's hardly ubiquitous, and we can see where folks wouldn't want to sign up just to check out a new app by an unknown startup. If you have your own library of tunes, though, this might be the time to give it a try. The app is free on iTunes and Google Play (links below), and is available in seven languages besides English.