Five-key flute Five-key flute The five-key flute is a musical instrument once common in school marching bands, and composed of wood with metal keys. It is a transposing instrument, most commonly in Bb, this variant being known as the Bb flute and sounding one tone below the orchestral piccolo. The next most common variant is the Eb flute, sounding a fifth below the Bb flute and used as its bass instrument in band harmonies. It is now often found in British military corps of drums, often playing various regimental marches. As the name suggests, the five-key flute most commonly has five keys,
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