When John Bonham died on September 25, 1980, Led Zeppelin immediately suspended all activity. Just two years earlier the Who had pledged to carry on after drummer Keith Moon died, but Led Zeppelin took a different approach. To them, Led Zeppelin was a four-man effort, and they weren't going to carry on with a new member. That doesn't mean the surviving members never played together again. Jimmy Page and Robert Plant have reunited a number of times over the years, and every once in a while they let bassist John Paul Jones join them. Here's a look back at various Led Zeppelin reunions over the past three decades. (Note: the band reformed for private rehearsals in Bath, England in 1986 and again at Jason Bonham's wedding in 1990, but there's no video from these private affairs, so they weren't included here.)