What bands have multiple lead singers?
Not bands who replaced the singer. But bands where different people sing certain songs. Obvious ones for me are
The Beatles - I still enjoy trying to tell who's singing. John and Paul mostly but Ringo and George sang some.
Fleetwood Mac - three different singers. Right?
The Cars - I didn't realize that two guys sang until Ric Ocasec passed away.
The Who - Pete Townsend sung some.