Fleetwood Mac: Bob Welch
Fleetwood Mac is perhaps the group with the highest number of early lineup changes out there. All three of the band’s original members quit within the first few years after the band formed. So, Bob Welch, Bob Weston, and vocalist David Walker replaced them by 1971.
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But, like their predecessors, the new members didn’t last long in Fleetwood Mac and departed dramatically, one and all, by 1974. The remaining band-members−Mick Fleetwood and John and Christine McVie−recruited with Lindsey Buckingham as their new guitarist, who brought along his bandmate Stevie Nicks. In 1977, they topped the U.S. charts with the album Rumours.