The term 'clarinet range' refers to the range of notes that can be played on a clarinet. The ALTO clarinet is a type of clarinet that is pitched in the key of E-flat, and is one octave lower than the standard B-flat clarinet. It is often used in orchestral and band music, as well as jazz and other genres. The ALTO clarinet has a range of three octaves, from the low E-flat below middle C to the high E-flat two octaves above middle C.