White Album," Tusk is less a collection of finished songs than a mosaic of pop-rock fragments by individual performers. Tusk's twenty tunes—nine by Lindsey Buckingham, six by Christine McVie, five by Stevie Nicks — constitute a two-record "trip" that covers a lot of ground, from rock & roll basics to a shivery psychedelia reminiscent of the band's earlier Bare Trees and Future Games to the opulent extremes of folk-rock arcana given the full Hollywood treatment. "The White Album" was also a trip, but one that reflected the furious social banging around at the end of the Sixties. Tusk is much vaguer. Semiprogrammatic and nonliterary, it ushers out the Seventies with a long, melancholy sigh.

On a song-by-song basis, Tusk's material lacks the structural concision of the finest cuts on Fleetwood Mac and Rumours. Though there are no compositions with the streamlined homogeneity of "Dreams," "You Make Loving Fun" or "Go Your Own Way," there are many fragments as striking as the best moments in any of these numbers.

If Christine McVie and Stevie Nicks were the most memorable voices on Fleetwood Mac and Rumours, Lindsey Buckingham is Tusk's artistic linchpin. The special thanks to him on the back of the LP indicates that he was more involved with Tusk's production than any other group member. Buckingham's audacious addition of a gleeful and allusive slapstick rock & roll style—practically the antithesis of Fleetwood Mac's Top Forty image — holds this mosaic together, because it provides the crucial changes of pace without which Tusk would sound bland.

"Not That Funny," "What Makes You Think You're the One," "That's Enough for Me" and "The Ledge" affect a rock & roll simplicity and directness that are strongly indebted to Buddy Holly, an obvious idol of Buckingham's. These songs have the sound and spontaneity of beautifully engineered basement tapes. A bit more sophisticated yet still relatively spare, "Save Me a Place" boasts closely harmonized, un-gimmicky ensemble voices and acoustic textures that underline the tune's British folk flavor. But Buckingham's most intriguing contribution is Tusk's title track, an aural collage that pits African tribal drums, the USC Trojan Marching Band and some incantatory group vocals against a backdrop of what sounds like thousands of wild do