The B-3 organ has a special place in jazz, and lately, its popularity has seen an upturn in KC. (Green Lady lounge, for example, replaced its piano with a B-3 in the upstairs space.) The sound, when driven by a master, can be an energetic swing dripping with the blues. Ohio's Bobby Floyd is one such virtuoso, and he's the guest star this week with KC's own Will Matthews Organ Trio. This is a rare performance, even for Matthews, whose day job — manning the guitar chair in the Count Basie Orchestra — keeps him plenty busy. Saturday at the Blue Room, prepare to swing.