Fleetwood Mac's massive pop success often overshadows the group's origins as one of the premier English blues bands of the sixties. Mac's 1972 album, „Bare Trees“, found the group searching for a new direction, having lost both of their stellar lead guitarists–Peter Green and Jeremy Spencer–to the excesses of the '60s rock lifestyle. Joined by new guitarist/vocalist Bob Welch and bassist John McVie's wife Christine on keyboards and vocals, Fleetwood Mac reinvented itself as a more pop-oriented rock band.