Bootsy Collins

Bootsy Collins gets down at George Clinton's birthday party Thursday night in the hangar at Woodstock '99 in Rome, New York at Griffiss AFB Park for the 30th Anniversary Concert. They are among over 45 bands performing on one of four stages July 23-25. (Photo by Scott Gries/ImageDirect)

Jon Paul Jones

LONDON, ENGLAND - NOVEMBER 10: Jon Paul Jones attends the Classic Rock Roll Of Honour at the Roundhouse on November 10, 2010 in London, England. (Photo by Gareth Cattermole/Getty Images)

Geddy Lee

LAS VEGAS - AUGUST 14: Rush singer/bassist Geddy Lee performs at the MGM Grand Garden Arena during a stop of the band's Time Machine Tour August 14, 2010 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

Jack Bruce

LAS VEGAS - NOVEMBER 11: Jack Bruce of Cream performs during the Rock 'n' Roll Fantasy Camp's 10th anniversary Campalooza concert at the House of Blues inside the Mandalay Bay Resort & Casino November 11, 2007 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

Geezer Butler

MELBOURNE, AUSTRALIA-AUGUST 10: Geezer Butler performs on stage with Heaven and Hell during their Heaven and Hell 2007 tour at Rod Laver Arena on August 10, 2007 in Melbourne, Australia. Heaven and Hell is a musical collaboration featuring Black Sabbath members Tony Iommi and Geezer Butler along with former members Ronnie James Dio and Vinny Appice. (Photo by Robert Cianflone/Getty Images)

John Entwhistle

Producer Kat Kramer kisses a photo of British rock musician John Entwistle (1944 - 2002), bassist of The Who, during a tribute sponsored by the Mod & Rockers 4th Annual Film Festival at Grauman's Egyptian Theatre, Los Angeles, California, June 30, 2002. Entwistle died June 27, 2002 in Las Vegas, Nevada. (Photo by Frederick M. Brown/Getty Images)