Altman used the best of the new wave of Jazz stars of the 90s. Here's what I could spot. 1st scene: Mark Whitfield; guitar Geri Allen; piano Nicholas Peyton; trumpet James Carter; tenor sax Christian McBride; bass Kevin Mahogany; vocals (as Big Joe Williams singing at the bar) all of these people were major recording artists at the time of production. In the later scene, Russell Malone is on guitar and Cyrus Chestnut is on piano as Count Basie. The final scene has Ron Carter and Christian McBride on upright basses for Solitude. The clarinet player is Don Byron.