The term soprano clarinet is used occasionally to refer to those instruments from the clarinet family that occupy a higher position, both in pitch and in popularity than subsequent additions to the family such as the basset horns and bass clarinets. The B♭ clarinet is by far the most common type of clarinet and the unmodified word "clarinet" usually refers to this instrument. However, due to a tendency for writers and historians to imitate the terms used to denote instruments in other instrumental 'family groups' the term soprano is sometimes used to apply not only to the B♭ clarinet but also to the clarinets in A and C, sounding respectively a semitone lower and a whole tone higher than the B♭ instrument, and even the low G clarinet—rare in Western music but popular in the folk music of Turkey—sounding a whole tone lower than the A. While some writers reserve a separate category of sopranino clarinets for the E♭ and D clarinets, these are more usually regarded as soprano clarinets as well. All have a written range from the E below middle C to about the C three octaves above middle C, with the sounding pitches determined by the particular instrument's transposition.