The alto flute is larger than the C-Flute and is characterized by a distinct mellow tone in the lower portion of its range. It uses the same fingerings as the C-Flute but is pitched in the key of G, sounding a fourth lower than the C-Flute. It’s often heard in movie scores; less often in classical orchestral music.
Its headjoint may be straight or curved. Many players prefer a curved headjoint (shown below) because it requires less of a stretch for the arms and makes the instrument feel lighter by moving its centre of gravity closer to the player. Other players prefer the straight version for acoustical reasons.