The ancient Greek double aulos (diaulos) consisted of two pipes (auloi) attached at the mouthpiece and sometimes held in place with a leather strap (forveia) to the player's face. The pipes could be of equal length or unequal, the latter giving a double, supporting melody. The sound produced was rich, rhythmical and penetrating, often in support to a male chorus. (Museum of Musical Instruments, Katakalon, Greece)
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