RIP Adam "MCA" Yauch: Snoop Dogg, Common, Slash and More Pay Tribute to Trailblazin' Beastie Boy

Friends and celebs mourn the rap-rock pioneer, who died of cancer Friday at the age of 47

As the music biz—and fans worldwide—mourn the death of Beastie Boys cofounder Adam Yauch, who passed away Friday at 47 after a battle with cancer, friends and celebs are stepping forward to pay tribute to his pioneering influence, and the musical legacy he leaves behind.

Many took to Twitter to express their sadness, giving props to the rap-rocker's trailblazing vision, and his friendship…

MORE: Beastie Boys Rapper Adam "MCA" Yauch Dead at 47

Snoop Dogg: "RIP MCA U are a Legend and a pioneer. #BeastieBoys4life"

Travis Barker: "Rest In Peace Adam Yauch /MCA. 4ever somebody i looked up to & had the pleasure of meeting. Damn this bums me out, we lost one of the best"

Kevin Smith: "RIP Adam Yauch. You made my teenage years more fun and your art made it easier for me to do what I do. For a Beastie, you sure were a beaut."

Common: "God Bless the soul of Adam Yauch aka MCA of the Beastie Boys. RIP"

Rainn Wilson: "RIP Adam Yauch (MCA of the Beastie Boys). He was a super-genius, a visionary and, most importantly, a really good person."

Rob Thomas: "holy s--t. R.I.P. ADAM YAUCH. MCA, you will be missed."

Slash: "Sad day. MCA was f--king awesome. RIP man. We'll miss you very much."

Jon Cryer: "We are gonna miss all the greatness you still had left inside you. RIP Adam Yauch"

Mario Lopez: "Beastie Boys were such a part of my soundtrack as a youth growing up... R.I.P MCA..."

311: "Much love & respect, Adam Yauch. Our best to the #BeastieBoys family."

Kal Penn: "Sad news about #MCA"

Milla Jovovich: "we lost one of our greatest talents today. my prayers and thoughts go out to the family and friends of Adam Yauch. Beastie Boys for life."

Chris Hardwick: "RIP MCA. Interviewed him briefly once and he couldn't have been sweeter or cooler. This sucks a lot.

Mandy Moore: "sending energy and light to Adam Yauch's loved ones.....#RIPMCA"

Michelle Branch: "Just heard about Adam Yauch. Beyond bummed. So so so sad."

Estelle: " RIP Adam Yauch of the LEGENDARY Beastie Boys ... damn."

Josh Groban: "Oh no. This just sucks beyond measure. RIP MCA."

Gwyneth Paltrow: "MCA forever."