The term 'Jazz Band Staple' refers to two instruments commonly found in jazz bands: HORN (4 letters) and SAX (3 letters). Horns are brass instruments that produce a loud, brassy sound, and are often used to provide the melody in jazz music. Saxophones are woodwind instruments that produce a smooth, mellow sound, and are often used to provide accompaniment in jazz music. Together, horns and saxophones are essential components of any jazz band.