1908—L. J. DeBekker, in Stokes’ Encyclopedia of Music and Musicians, says, “Capable of such gradations of tone as can be otherwise obtained only from viol instruments or the human voice, the trombone is among the oldest of musical instruments in the world….The trombone has seven positions, defined by elongations of the tube, each with its series of open tube harmonics, and in the hands. Music is composed and performed for…