1968: yes, it's still september 7

The legendary British blues-rock band The Yardbirds broke up in July of 1968. They were primarily famous as the home of the great guitarists Eric Clapton, Jeff Beck, and Jimmy Page, by the time of the break-up only Page remained. The band was still contracted for a few gigs, and so Page put together a group of players to fulfill those contracts, calling them the New Yardbirds, who played together for the first time on September 7 in Denmark. Page's fellow musicians: Robert Plant on vocals, John Paul Jones on bass and keyboards, and John Bonham on drums. Less than two months later, they played their first concert under their new name: Led Zeppelin.