Lazy Ade Monsbourgh was an Australian musician active in the trad jazz movement, who performed with his Late Hour Boys. The Late Hour Boys recorded for Swaggie. Monsbourgh played clarinet, alto sax, trumpet, and trombone. Monsbourgh also played with pianist Graeme Bell's Australian Jazz Band. Lazy Ade And His Late Hour Boys sometimes performed as a featured unit within performances by Graeme Bell's Australian Jazz Band.