A Life Bridging Worlds: Hans Keller (1919-1985) Born into a cultivated Jewish family in Vienna in 1919, Hans Keller’s early life was steeped in musicality. His upbringing wasn't merely one of appreciation; it was an immersion. He received instruction from Oskar Adler, a figure who had previously mentored Arnold Schoenberg – a connection that would subtly yet profoundly shape Keller’s later analytical approach. This foundation, however…