...then it might look something like this. Talented producer and 3d artist TomoP has made a video of some very cute low-polygon count models of the Idolmaster girls dancing to "Go My Way!" over at Nico Nico Douga.
Namco should go and hire this guy and get working on a DS port — touching included, of course. You can see TomoP's other Idolmaster videos featuring the loli twins, Ami and Mami (popularly known as "Tokachi"), recreating various anime openings and endings below.
I know my daughter would play the hell out of this, but then again, she's 8 - she thinks Hanna Montana is the pinnacle of music. (Don't worry - I'm educating her.)