I seriously doubt ABBA, who stuck with the Disco sound through most of their careers, has more "sonic variety" than Katy Perry's genre salad albuns like 'Prism'.
Fleetwood Mac changed their sound a couple of times and they are at the bottom of the ranking as well. Just shows how hard is to measure stuff like this
Fleetwood Mac changed their sound a couple of times and they are at the bottom of the ranking as well. Just shows how hard is to measure stuff like this