Video: Beastie Boys? Adam Yauch dies at 47

Yauch, known as MCA, has died after a long battle with cancer. As one of the founding members of rap group the Beastie Boys, he helped define 80?s music. NBC?s Brian Williams reports.

>>> a major loss in the music business . adam yauch of the beastie boys has died after a long fight with cancer. he was known as mca, and the three musicians together sold 40 million records and growing. along with run dmc , they helped defind 80s music to the first white rap artists and in hip-hop, they were among view at the vanguard of the movement. he was a self-taught musician and later a filmmaker. he leaves behind a wife and a 13-year-old daughter. he was 47 years old.

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