When Juan Tizol came to me after I'd been in the band a couple of months - the first couple weeks Billy Strayhorn and I roomed together, because he used to go with the band once in a while. There's a genius. Billy Strayhorn was a genius. I learned an awful lot. I made the mistake of saying to him, when I first met him, "Billy Strayhorn, how did Duke Ellington voice Caravan? " He went like this to me: naaaaaaaaa. They kept their ideas secret. Only later on, they came to me, and Duke Ellington showed me how they did it. But when I first joined the band, Juan Tizol said, "I told Duke Ellington that you write arrangements. So Duke Ellington says, "Tell Louie to bring in an arrangement. " When Juan Tizol came back to me, I said, "Are you kidding? Me bring an arrangement to Juan Tizol, Billy Strayhorn, and Duke Ellington? No way. " So Juan Tizol came to me a second time. "Duke Ellington said, `Bring the arrangement in'. " He had to ask me three times. He said, "Now, Lou. Bring in those arrangements. " I handed them to Duke Ellington, and I ran. The thing that knocked me out with, the first time he heard The Hawk Talks, he recorded it on Columbia. I was amazed.