The holiday season will see a battle between Elmo and Mickey as the two engage in a musical duel. Elmo won't just be dancing this year, he'll also be forming his own rock band with your lil one. Let's Rock Elmo ($70) features technology allowing the furry red monster's hands to detect which of the four included instruments is in front of him. Kids can choose whether Elmo plays the drums, guitar, microphone, or tambourine and can join in six preprogrammed songs with the unused pieces. Three additional instruments are available for purchase as well. Fisher Price's Rock Star Mickey ($50) rocks out with his guitar and American Idol moves. He sings, dances, and even does the splits as he encourages tots to jam along with him.