2. Led Zeppelin
For anyone born too late to catch Led Zeppelin in concert, watching old live footage of the band can be a painful and bittersweet experience. The group have reformed on a few occasions since drummer John Bonham died in 1980, and Robert Plant and Jimmy Page have toured together, but Plant is dead-set against ever launching a full-on Led Zep reunion. Looking back, it's easy to see why they'd be reluctant to do it without Bonham – he's one of the best rock drummers of all time, and utterly crucial to their sound. Anything less wouldn't be good enough.