Mike Portnoy  - RIP Robin...you indeed said it best! #CarpeDiem

Bumblefoot  - R.I.P. ROBIN WILLIAMS :(

David Coverdale ‏- R I P Sweet Robin...Sad Day...Thoughts & Prayers To Family & Friends...XX 

Lzzy Hale - A staple of my childhood. You will be missed #ripRobinWilliams

Wolfgang Van Halen - I’m speechless… Robin Williams was such an amazing and important man. My condolences to his family. Rest in peace.

Tony Franklin - Saddened to hear about Robin Williams. Genius talent. Thanks for all the smiles Mr Williams. That's your true legacy!

Gene Simmons - R.I.P. Robin Williams. A kind and generous man.

Ozzy Osbourne - Such a tragic loss. I will always have amazing memories of @RobinWilliams. Respect and love goes out to his family.

Michael Sweet - I'm in shock over the news of Robin Williams passing! It's so tragic & a reminder of how precious life is. God bless Robin & his family....

Yngwie Malmsteen  -  Robin Williams; you will live forever in people's hearts. You were a true entertainer.

Zach Myers - We just lost the last of the golden age of comedy .......

John Elefante - I am really bummed about the death of Robin Williams, one of the best in the biz, and a suicide, so sad!!

GUN - Why oh why #robinwilliams Those dark demons got the better of you.  Sleep sound dear friend #Godbless #RIp.

Lee Small - Shocked to read of the passing of the great Robin Williams, comic genius for sure but playing it straight in Awakenings he was magical x

BulletBoys - OMG!!!! R.I.P. #RobinWilliams Possibley The Best Comedian/Actor Ever!! The whole World will miss you!O:-)<3

Jeff Scott Soto - So sad to see the report of Robin Williams found dead of apparent suicide...