http://hardbop.tripod.com/milt.html
(January 1, 1923 - October 9, 1999)
Milt Jackson was nicknames "Bags" because he carried his collapsable vibraphone in a bag on his back. He was also know to stay up late (hence, bags under the eyes - smile). He was probably most known being in the Modern Jazz Quartet though for a short time prior to that the band had been called the Milt Jackson Quartet. They performed together for some 20 years, broke up and then got back together several years later.
