there's several types of groups which have dancer members, sometimes in addition to other roles, perhaps sometimes solely dancers. some examples I can think of would be Kpop boy bands/girl groups (and non-Kpop groups too) (example) and ballet companies (example, with list of dancers here). I seem to also remember hearing that some cultures more closely tie dancing and music together, which might mean more such groups, but I don't know of any specific examples offhand...

(also special mentions to The Mighty Mighty Bosstones, as they had a member who mostly just danced on stage, plus I guess backing vocals too, and also Beats Antique, one of their members started out as a dancer but later started producing music with the group)