J ohn Scofield’s CD EnRoute is a return to jazz trio playing and a reunion with drummer Bill Stewart. The first tune on the disc, “Wee” by Denzil Best, is based on “rhythm changes,” which is a 32 bar, AABA form (and the changes to Gershwin’s “I Got Rhythm”). Stewart begins the tune by setting up the feel with an eight-bar introduction. After the guitar solo, bassist Steve Swallow and Stewart trade eights and fours over the “rhythm changes” form. The last time through the head, Stewart solos over the bridge, or “B section” of the tune