A number of hard rock and heavy metal musicians have commented on the passing of Adam "MCA" Yauch, a founding member of the pioneering rap band BEASTIE BOYS, who died Friday after a nearly three-year battle with cancer.Slash (VELVET REVOLVER, GUNS N' ROSES): "Sad day. MCA was fucking awesome. RIP man. We'll miss you very much." ANTHRAX: "RIP MCA. Cancer, you're an asshole." Dave Mustaine (MEGADETH): "Rest In Peace Adam 'MCA' Yauch of the BEASTIE BOYS. My condolences to his family and friends." LINKIN PARK: "We're sad to learn about the death of MCA. Our condolences to the BEASTIE BOYS and Adam's family." Fred Durst (LIMP BIZKIT): "A very sad day indeed. Adam Yauch RIP." David Draiman (DISTURBED): "Listened to the BEASTIE BOYS since I was a kid. RIP Adam (MCA) Yauch. You will be missed." Randy Blythe (LAMB OF GOD): "BEASTIE BOYS broke a lot of rules and broke a lot of ground. Bummed I never saw 'em. MCA has gone on to his final egg raid on mojo. Peace bro!" Freddy Cricien (MADBALL): "RIP to a hip hop legend and my favorite beastie boy.... MCA" SPINESHANK: "RIP MCA!!!!! Thanx for the awesome music!" BONDED BY BLOOD: "R.I.P. MCA! Our set tonight (in Dallas) goes out too you!" Brian Fair (SHADOWS FALL): "RIP MCA of the BEASTIE BOYS. My favorite show ever was seeing them at a small club in Boston on 'Check Your Head' tour. Thanks for the music." Justin Broadrick (GODFLESH, JESU): "Very sad to hear of the passing of Adam Yauch / MCA." SICK OF IT ALL: "Our hearts go out to MCA's family and friends in their time of loss. We had the pleasure of doing a small tour with the BEASTIE BOYS under their hardcore name QUAZAR. They were the most down-to-earth and fun guys. Thanks for all the great times and music and all your humanitarian work you've done. Rest in peace, brother. A sad day indeed." LIVING COLOUR: "Cause You Can't, You Won't And You Don't Stop, MCA Come And Rock The Sure Shot - RIP Adam Yauch!" STYX: "Another great one has passed. RIP MCA. Truly one of the best at what he did." Jeff Scott Soto (TALISMAN, JOURNEY, YNGWIE MALMSTEEN): "RIP MCA...you showed us how to 'fight for the right', long live the Beasties! Perry Farrell (JANE'S ADDICTION): "Adam Yauch has passed. As sobering news as you'll ever recieve. This part of life (death) is resolute — causes one to consider their own life, and the way they're living it. Today is a grey day. It feels as if their is no escape... Adam was a guy who brought happiness and energy to so many. That is why the news of his passing is so stifling. Bon voyage, Adam."