While most bands undergo a number of changes over the course of their careers, few groups experienced such radical stylistic changes as Fleetwood Mac. Initially conceived as a hard-edged British blues combo in the late '60s, the band gradually evolved into a polished pop/rock act over the course of a decade. Throughout all of their incarnations, the only consistent members of Fleetwood Mac were drummer Mick Fleetwood and bassist John McVie -- the rhythm section that provided the band with its name. Ironically, they had the least influence over the musical direction of the band. Originally, guitarists Peter Green and Jeremy Spencer provided the band with its gutsy, neo-psychedelic blues-rock sound, but as both guitarists descended into mental illness, the group began moving toward pop/rock with the songwriting of pianist Christine McVie. By the mid-'70s, Fleetwood Mac had relocated to California, where they added the soft rock duo of Lindsey Buckingham and Stevie Nicks to their lineup. Obsessed with the meticulously arranged pop of the Beach Boys and the Beatles, Buckingham helped the band become one of the most popular groups of the late '70s. Combining soft rock with the confessional introspection of singer/songwriters, Fleetwood Mac created a slick but emotional sound that helped 1977's Rumours become one of the biggest-selling albums of all time. The band retained its popularity through the early '80s, when Buckingham, Nicks, and Christine McVie all began pursuing solo careers. The band reunited for one album, 1987's Tango in the Night, before splintering in the late '80s. Buckingham left the group initially, but the band decided to soldier on, releasing one other album before Nicks and McVie left the band in the early '90s, hastening the group's commercial decline.

t's unfair to say that Fleetwood Mac had no pop pretensions prior to the addition of Lindsey Buckingham and Stevie Nicks to the lineup in 1975. When they were led by Bob Welch they often flirted with pop, even recording the first version of the unabashedly smooth and sappy "Sentimental Lady," which would later be one of the defining soft rock hits of the late '70s. Still, there's no denying that 1975's Fleetwood Mac represents not just the rebirth of the band, but in effect a second debut for the group -- the introduction of a band that would dominate the sound of American and British mainstream pop for the next seven years. In fact, in retrospect, it's rather stunning how thoroughly Buckingham and Nicks, who had previously recorded as a duo and were romantically entangled in the past, overtook the British blues band. As soon as the Californian duo came onboard, Fleetwood Mac turned into a West Coast pop/rock band, transforming the very identity of the band and pushing the band's other songwriter, keyboardist Christine McVie, to a kindred soft rock sound. It could have all been too mellow if it weren't for the nervy, restless spirit of Buckingham, whose insistent opener, "Monday Morning," sets the tone for the rest of the album, as well the next few years of the group's career. Surging with a pushily melodic chorus and a breezy Californian feel, the song has little to do with anything the Mac had done before this, and it is a positively brilliant slice of pop songwriting, simultaneously urgent and timeless. After that barnstorming opener, Buckingham lies back a bit, contributing only two other songs -- a cover of Richard Curtis' "Blue Letter," the second best up-tempo song here, and the closer, "I'm So Afraid", while the rest of the album is given over to the wily spirits of Nicks and McVie, whose singles "Rhiannon," "Say You Love Me," and "Over My Head" deservedly made this into a blockbuster. But a bandmember's contribution can never be reduced to his own tracks, and Buckingham not only gives the production depth, he motivates the rest of the band, particularly Nicks and McVie, to do great work, not just on the hit singles but the album tracks that give this record depth. It was diverse without being forced, percolating with innovative ideas, all filtered through an accessible yet sophisticated sensibility. While Rumours had more hits and Tusk was an inspired work of mad genius, Fleetwood Mac wrote the blueprint for Californian soft rock of the late '70s and was the standard the rest were judged by.

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