there's not such a one rule that you can only play tchaikovsky in this way. you can only play beethoven in that way. you know, if that's the case nobody want to become a musician. because being a musician there's no limit. >> and similarly you would say that about your collaborations with people like pharrell or metallica. these are about musicians at the opposite end of the universe from your traditions. that's pretty out there. >> i mean, the important things are quite clear. they're wonderful musicians. and as a musician, we will collaborate with great musicians, no matter what- type of genre - what type of style. >> do you learn something from the experience? >> absolutely. i mean, with metallica, i learn so much, and i kind of - harmonies, that i never played in classical music. but also, i found out, the things they are doing, sometimes it's similar to some of the contemporary music we are doing. like, let's say bartok, for example, you know? he's quite rock n' roll, with his concerto no. 2, concerto no. 1. >> bartok is rock n' roll? >> absolutely. >> i