Batman: Gotham Adventures #28

A popular musician is kidnapped by the Riddler, who proceeds to leave baffling riddles for Batman, Robin and Nightwing. But the joke's on E. Nigma when the musician begins leaving his own clues for our heroes in an attempt to outwit the Riddler! Will the Riddler become aware of these double-crosses and end the musician's career once and for all, or will the Bat-family get hip and make all the right moves to save the chart-topper?