An aulos (Ancient Greek: αὐλός, plural αὐλοί, auloi) or tibia (Latin) was an ancient Greek wind instrument, depicted often in art and also attested by archaeology. Though aulos is often translated as "flute" or "double flute", it was usually a double-reeded instrument, and its sound—described as "penetrating, insisting and exciting"—was more akin to that of the bagpipes, with a chanter and (modulated) drone.