some of the most famous singers and musicians are only known by one 'stage name', for example:
SLASH
CHER
IGGY POP
However there are some bands which name the group together as a whole, despite there being a clear lead singer, some examples of these are:
KISS
FALL OUT BOY
RED HOT CHILI PEPPERS
THE KILLERS
GUNS AND ROSES
THE SEX PISTOLS
POISON
AEROSMITH
QUEENS OF THE STONE AGE
In our 'band' there is a lead singer, and possible other musicians, but they do not contribute to the song as much. therefore we could steer towards a name that puts our lead above the others, such as:
FLORENCE AND THE MACHINE
MARINA AND THE DIAMONDS