Tusk (1979)

After the polished success of Rumours, Lindsey Buckingham steered Fleetwood Mac into odd, raw-sounding experiments, recording some parts at home and reportedly using tissue boxes as percussion. The title track, with the USC Trojan Marching Band crashing in, is the one that explains the double album's nerve. Stevie Nicks's Sara keeps the band's softer side in view.