Becky Lang's piece on the emergence of bland, catch-all "hipster" identity ended with a reference to Harry "The Hipster" Gibson. Here's a clip of him performing "Keep the Beat" from the 1946 movie Junior Prom. Dig it!
"Like a fish in a pool"
If you think being a "hipster" is novel, here's some advice on how to do it... from 1947.