The term "jam band" didn't really exist during Cream's brief run in the 1960s, but listen to their 17-minute rendition of "Spoonful" or their 16-minute version of "Toad" on Wheels of Fire. By any definition, those are jams: If the tapes had been running on a different night, they would have sounded different. Jack Bruce, Eric Clapton and Ginger Baker were all virtuosos at their instruments and their concerts remain the stuff of legend. They broke up in 1968, but in 2005 they briefly reunited for a series of shows in London and New York. The death of Jack Bruce ended any chance of more activity.