Adam Yauch, one-third of the pioneering hip-hop group the Beastie Boys, has died at the age of 47. Yauch, also known as MCA, had been in treatment for cancer since 2009. The rapper was diagnosed in 2009 after discovering a tumor in his salivary gland.

In addition to his career with the Beastie Boys, Yauch was heavily involved in the movement to free Tibet and co-organized the Tibetan Freedom Concerts of the late Nineties. In 2002, he launched the film production company Oscilloscope Laboratories. He will be missed.