Adaptr

This is the simplest way to license commercial music for developers. Definitely have a look at it, if you're a developer.

This has taken our team the better part of the past three years to license and build. Adaptr.com is the FIRST multi-label and multi-publisher self-service platform to allow interactive major and indie label music content for developers and young companies. We have been lucky to have FANTASTIC partners such as Warner Music Group, Kobalt, BMG, Warner-Chappell, eOne, ASCAP, BMI, SESAC and many other who have supported us in this effort. We are truly excited to share this ground-breaking API platform with the developer community to make licensing easy, affordable, while making sure the artists and songwriters we know and love get fairly compensated.

wow, nice democratization of the music licensing