<Li> Reese Witherspoon as Rosita, a pig who gave up her teenage music dreams to become a devoted wife to Norman, and mother to their 25 piglets . </Li> <Li> Seth MacFarlane as Mike, a white mouse with a big Frank Sinatra-esque voice and an arrogant attitude . </Li> <Li> Scarlett Johansson as Ash, a teenage porcupine punk rocker who takes part in an alternative - rock music duo with her boyfriend Lance . </Li> <Li> John C. Reilly as Eddie Noodleman, a sheep and Buster's friend who doubts the future of the theater . </Li>

Who does the voice of the porcupine in sing