Let’s argue over something meaningless but fun: best supergroup that you could put together.
Freddy Mercury, vocals
Jimi Hendrix, guitar
John Bonham, drums
Geddy Lee, bass
Not a bad grouping. As others have pointed out, vocals depends on what you seek, albeit, no argument that Mercury had a pure, raw and top of the line, kick ass voice for more genres than just rock. Drums, too, how about some of the Jazz infused folks like Guy or Watts? Hendrix, another raw, extremely talented rocker with few peers. Maybe Clapton, after all: Clapton is God.