On July 21, a quartet of gifted musicians serve as the latest guests in Polyrhythms' Third Sunday Jazz Workshop and Matinée Series, with Davenport's Redstone Room hosting an evening of jazz originals and standards with the 3 Dawgs & a Bone ensemble of Scott Barnum on bass, Jim Dreier on drums, Steve Grismore on guitar, and Rich Medd on bone – trombone, that is.