Sunday night's Sunflower Jam in London was one of those nights of rock revelry you dream of. Classic rock artists from across the spectrum joined together for one cause, to play a set full of unexpected collaborations and covers. Alice Cooper, Brian May of Queen, John Paul Jones of Led Zeppelin and Bruce Dickinson of Iron Maiden were just a few of the rockers on hand for the annual charity event.

For the sixth straight year Jacky Paice, the wife of Deep Purple drummer Ian Paice, organized an all-star concert to raise money to support alternative and holistic treatments for cancer. The Sept. 16 concert took place at the Royal Albert Hall in London.

May was involved in the night's most impressive collaborations, including 'School's Out' with Cooper (video below) and Deep Purple's 'Black Night.' The finale was an all-star jam featuring May and British singer Kerry Ellis helping out on 'Smoke on the Water.' A complete setlist -- including the folk cover of Guns N' Roses' 'November Rain' -- is available at Queen's official website. More video is available at Bravewords.com.

Watch Brian May and Alice Cooper Perform 'Schools Out'
Watch the All-Star Jam of 'Smoke on the Water'