 probably most people don't know the backstory behind that song. It's a Billy Strayhorn connection. It was Billy Strayhorn. Billy Strayhorn, who was a young guy in Pittsburgh who wanted a job with the Ellington band. And he called up Duke Ellington. Ellington said, come to Harlem and interview with me. He sent him directions. And the directions included taking a train called the A train. And Strayhorn figured, geez, if I could turn those directions into a song, won't I look brilliant?