Rock guitarist Ronnie Montrose passed away on Saturday, March 3, at the age of 64. Montrose founded the legendary band of the same name with Sammy Hagar in the early 70s, launching their careers to a whole new level. Several rockers have already reacted on Twitter expressing their sadness and gratitude to Ronnie Montrose and the music he created. Among those expressing their condolences are Slash, Nikki Sixx and Megadeth's Dave Ellefson who played with Montrose for a few years. They all seem to agree that the debut Montrose release was a real game-changer for the genre. Read the Tweets from Montrose's fellow rockers below.