MTV News caught up with Christina Aguilera and Alicia Keys last month at New York’s Electric Lady studios where the two collaborated on ‘Impossible,’ a track Keys co-produced for Aguilera’s upcoming album. Aguilera told Keys as she sat at the piano, “I like the piano. Now I gotta learn how to play. You inspire [me].” Keys responded, “I like them vocals. We’re smashing. Official killer. ‘Killer Chris!'” Read more.