Before the Hollywood Bowl got its first shell (in 1926, which only lasted one year) the musicians and entertainers performed in the open air. The stage itself changed from time to time, but this is the first photo I’ve seen of a circular one. I don’t know which orchestra was playing that day (this photo is from 1926) but they must have been popular because it looks like every single seat is filled.

Here’s a second shot taken at the back of the stage: