Milton (Milt) Jackson (January 1, 1923 in Detroit, Michigan – October 9, 1999) was an American jazz vibraphonist and one of the most important figures in the hard bop style. A very expressive player, Jackson differentiated himself from other vibraphonists in his attention to variations of dynamics and rhythm. He was particularly fond of the 12-bar blues at slow tempos. He preferred to set the vibraphone's oscillator to a low 3.3 revolutions per second (as opposed to Lionel Hampton's speed of 10 revolutions per second) for a more subtle vibrato. Jackson was also a capable pianist, and sometimes performed professionally on that instrument. He also sang on a few albums. (Soul believer, e.g.)