I've gone by the beginners. I'm working up to your class.
6 seconds sound clip from the Destination Freedom - The Trumpet Talks (The early life of Louis Armstrong) classic radio play.
You can hear this line at 00:23:57 in the radio play.
Quote context
[...]
- I can blow the trumpet some. I want a place in his band.
- Just by handlin' coal he's learned to handle a trumpet?
- Kid we ain't got time to teach beginners....
- I've gone by the beginners. I'm working up to your class.
- Well, listen to that, will ya?
- When night came, it found the kid back at Diamond Stone's...
- And they let him get on the bandstand, and Bunk put a battered old horn in his pocket.
- We'll tell you when to try to blow in.
[...]