>> gretchen: that's the way to play the cello, right? there is only one way to play rock'n'roll. the two cellos are out to prove everyone wrong. they tackle everything from ac/dc to elton john. >> steve: right now let's welcome our buddyies, stefan and lieu coo. good morning to both of you. >> good morning. >> steve: when you guys were younger, you were actual cello rivals, is that right? you hated each other's guts? >> well, he was like -- i was way better than him. [ laughter ] >> brian: were you way better than him? >> he couldn't beat me, so he joined me. >> gretchen: i get it. you guys are a good team. >> brian: do you like this brand of music? do you prefer classical? do you like the transition? >> we love everything. we are young. we like to rock, but we also love classical music, which we grew up with.