A key architect of Fleetwood Mac’s mid-’70s makeover into solid-gold hitmakers, Lindsey Buckingham has loaded up the classic-rock canon with honey-dipped tunes that often conceal a bitter core—certainly, few breakup songs are as equally elating and deflating as “Go Your Own Way.” But Buckingham was also the sonic mastermind that steered the Mac toward the percussive experimentation of 1979’s Tusk, betraying a maverick streak that’s made him an unlikely alt-rock figurehead.