BOP.fm is a Y Combinator-backed online music service that gives you access to every song on the internet. The company aggregates several popular music services (Spotify, Rdio, iTunes, YouTube, SoundCloud, Deezer, etc.) into one interface. Users can then search for any song, play it using any service, and share/discover with any friend (even if they use a different service than you). BOP.fm offers this same aggregation and service-agnostic music playback for others, including Rap Genius as well as music content publishers, messaging clients, social networks, artists/labels, and other partners. (Acquired by Lifelock, 2015.)