The term 'KIND OF SAX' refers to the four main types of saxophones. The ALTO saxophone is a medium-sized instrument with a range of about two and a half octaves. The TENOR saxophone is larger than the ALTO and has a range of about two and three-quarters octaves. The BASS saxophone is the largest of the four and has a range of about three octaves. Finally, the SOPRANO saxophone is the smallest of the four and has a range of about two octaves.