1. In Classical Greece, the aulos was a simple double-reed woodwind, usually with only four or five fingerholes. Characteristically, two were played at once, as we see in the images below.

2. By Roman times, the playing of a single aulos was common. The single aulos, called a monaulos, could be a much more elaborate instrument, with as many as 13 or 14 fingerholes, and metal bands to allow "tuning" of the aulos to different scales. Below are four auloi found in Pompeii (made of ivory), thus of the 1st c. AD. (The schematic is from S. Hagel, JHS 128 (2008).)

Click here for an introduction to the kithara (a performance lyre)