Emma can mean several bands. Either you're talking about ex-Spice Girl
Emma Bunton, or the emo/hardcore band Emma, later know as
GunsLikeGirls who split in early 2007. Emma is also an underground folk singer. You can also be talking about a french folk-rock band frome the late 90's, that did two albums : "Demon's stories" and "Trande Winds in a loft". Emma is also the name of the UK's entry in the 1990 Eurovision song contest.
There is also a psychedelic rock band from Ann Arbor, Michigan known as Emma.
And there is also the
Emma made up of
Erin McKeown and
Alison Miller
Emma