It's an incredibly sad day in music as Adam Yauch (aka MCA) has passed on at the age of 47.

TMZ is reporting that the rapper, who was diagnosed with cancerous parotid gland and a lymph node in 2009, has died. At this time details are scarce and it is unknown whether Yauch's death is related to his bout with cancer.

Yauch and the Beastie Boys were honored by being inducted into the Rock and Roll Hall of Fame at last month's ceremony. Yauch is survived by his wife and his daughter.

We will bring you more details as they become available...