Hard rock and heavy metal giants Dave Mustaine, Slash, Joe Perry, and more have hit Twitter to express their condolences to the family of the Beastie Boys’ Adam Yauch who passed away today at the age of 47:

Slash:

Sad day. MCA was fucking awesome. RIP man. We’ll miss you very much.

Alex Skolnick (Testament):

The Beasties reached across genres, uniting hip-hop fans w fans of rock & yes, metal.

Who else could have pulled off touring w Run DMC & a guest appearance from @Slayer‘s Kerry King (‘No Sleep till Brooklyn’)?

I remember being 18, far from home & in studio for 1st time. ‘License To Ill’ was our soundtrack. We’d blast it & sing along.

Joe Perry (Aerosmith):

Very sad news about MCA. He will be missed. Condolences to his family and friends

Corey Taylor (Slipknot/Stone Sour):

The world lost a true legend, and one of the nicest men I’ve ever met. His name is MCA. RIP Adam Yauch.

Dave Mustaine (Megadeth):

Rest In Peace Adam ‘MCA’ Yauch of the Beastie Boys. My condolences to his family and friends.

Anthrax:

RIP MCA. Cancer, you’re an asshole.

Godsmack:

Our condolences to Adam Yauch’s family from the Beastie Boys ….. RIP

Tom Morello (Rage Against The Machine):

Rip dear Adam Yauch. Words can’t express the sadness and loss. Ur humor, talent & gentle soul are just irreplacable. Be at peace brother.

Mike Portnoy (Adrenaline Mob):

RIP Adam MCA Yauct – damn, so sad….Beastie Boy’s Paul’s Boutique is in my Top 10 of All Time…