Treble flute trill keys, and soldered keys. It is very similar to a piccolo, and plays in the same range, although, because it is a slightly larger instrument, it has a different quality at the upper end of its register, and it has an extended lower register, as compared with the piccolo. The instrument should not be confused with the Alto Flute, also in G, which is a larger instrument that transposing down by a fourth to the octave below the treble flute. Since the demise of the Renaissance flute consorts, the use of this treble flute in G seems to have
Alto flute the bottom octave and a half of its range. It was the favourite flute variety of Theobald Boehm, who perfected its design, and is pitched in the key of G (sounding a perfect fourth lower than written). Its range is from G (the G below middle C) to G (4 ledger lines above the treble clef staff) plus an altissimo register stretching to D. The headjoint may be straight or curved. British music that uses this instrument often refers to it as a bass flute, which can be confusing since there is a distinct instrument known by that name. This