6. John Paul Jones
Before John Paul Jones even joined Led Zeppelin he was considered one of the best session bassists in all of England, playing on tracks by Donovan, Jeff Beck, Cat Stevens and many others. When he formed Zeppelin with singer Robert Plant, drummer Jon Bonham and Jones' fellow session ace Jimmy Page, they formed one of the most powerful rock groups in history. Jones was content to stay in the background, but he was undoubtedly the backbone of their entire sound. In 2009 he grew weary of waiting for Robert Plant to commit to a Zeppelin tour and he formed Them Crooked Vultures with Dave Grohl and Josh Homme.