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Kalmen Opperman (December 8, 1919 – June 18, 2010) was an American clarinetist. He was a noted performer, teacher, conductor, mouthpiece and barrel maker (which he made only for his students), composer, and writer of numerous clarinet studies.
A noted pedagogue, many of his students are currently working as soloists, recording artists, orchestral players and university teachers around the world.
For many years he was a performer in Broadway shows during what many call Broadway's "Golden Age".
He wrote over 10 highly acclaimed study books for the clarinet including his multi-volume Daily Studies and Velocity Studies.
He also led the Kalmen Opperman Clarinet Choir.
His handmade mouthpieces and barrels are highly sought after items for professional clarinetists for their quality workmanship and sound.