Likely German classical composer from the short humor piece "The Life Drama of a Music Critic in Four Clippings," by Lawton MacKall. It first appeared in the July 1914 The Century magazine, and was reprinted in a 1922 collection of his work titled Bizarre. His bassoon concerto in F-flat major, known as the "Spring" concerto, is described as a "masterwork." The piece is played by Ludwig Käse of the Gotham Symphony Society.
Yesterday afternoon, at the concert of the Gotham Symphony Society, Ludwig Käse played that great German masterwork, the Leberwurst bassoon concerto in F-flat major, opus posthumous. ("Posthumous" does not in this case have its usual meaning of written after the defunction of the composer's brain: it refers to the fact that Leberwurst did not live to publish the work, as his audience lynched him when he played it from manuscript.) This concerto, dedicated to the composer's patron, the deaf old Duke of Pretzelheim, bears the title of "Spring," and this vernal quality was admirably brought out by Herr Käse, particularly in the movement representing influenza. Indeed, it was impossible to hear his sublime sniffulations without being moved to profound coughing.
Leberwurst's first name is not given. His name means "liver sausage" in German.