On TV: Ryan Cabrera, Madonna, Ashlee Simpson

Pop acts on television this week include Ryan Cabrera, who performs on ‘The Tonight Show with Jay Leno’ on Monday; Madonna, who “sets off a very special dance contest” on ‘Total Request Live’ on Monday; Ashlee Simpson, who performs on ‘Live with Regis and Kelly’ and ‘TRL’ on Tuesday, and ‘The Tonight Show’ on Friday; Christina Aguilera, who performs with Herbie Hancock on ‘The Tonight Show’ on Wednesday; and Ricky Martin, who performs with Amerie on ‘Live with Regis and Kelly’ on Thursday.