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The music world continues to mourn the death of Beastie Boys co-founder Adam Yauch. “MCA” passed away Friday at 47 after a long battle with cancer.

Friends and celebs are stepping forward to pay tribute to Yauch (pictured below, middle with Beasties Ad Rock and Mike D) and his pioneering influence.

Coldplay honored Adam Yauch with a Beastie Boys cover in concert, while many other stars took to Twitter to express their sadness. A sampling:

Mariah Carey's World
(Frederick M. Brown)

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.”