Why would Umas like Tachyon or Shakur even bother with the singing and dancing?

How can a Uma like Urara or Tannhauser even remember lyrics and choreographie of an entire idol performance?

i cant imagine air shakur to put on a frilly dress after the race and sing cliché idol garbage in front of an audience
if anything she'd get on stage, drop a bunch of slurs and does a yoko ono playing toilet sounds and incoherent screaming into the mic