That's the beauty of music. You can take a theme from a Bach sacred chorale and improvise. It doesn't make any difference where the theme comes from; the treatment of it can be jazz.
I used to take my mother to Yosemite. When I turned 14, I got my driver's license, and that's where she'd want to go, so I'd go take her there for two weeks.
When I was 20, Shostakovich was my favorite composer. I still find his Fifth Symphony wonderful, with its outstanding themes and rhythms. That's the piece that made me want to be a classical composer.
I started growing up in a hurry and taking a lot of the philosophy I'd heard from church as a kid a lot more seriously - especially the Ten Commandments - and wondering how 'Thou shalt not kill' could be so absolutely ignored. It took me until I was in my 40s to write what I was thinking as a young soldier.
I wanted to be like my father, who was a cattle man and a rodeo roper. And that was - he was my hero, and I wanted to be more like him.
After the Second World War, I returned to California to study composition with Darius Milhaud, who wrote wonderful works like 'Le Boeuf sur le Toit' and 'La Cretion du Monde.' I especially enjoy his work for two pianos, 'Scaramouche.'