Call it selling out an art form, giving the people what they want, or simply adapting to a changing world. But whatever you call the new strategy being employed by the Columbus, Ohio-based BalletMet, which includes joint appearances with the Ohio State marching band and dances choreographed to the music of techno icon Moby, the company insists that the steps are necessary for them to stay solvent in a world that seems increasingly resistant to traditional dance.