I come from an era of hi-fi. The whole idea of having a sound system do the work—that the music is reproduced through a sound system—is the very essence of the music. I just did this three-hour concert in Luxembourg and it was all on one file. I play the file and then play solitaire on my phone, out of sight. I practice a lot. If I don’t play solitaire every few days I get a little bit jittery. It’s very concentrating because you have to really look at the cards carefully.