Hornbostel - Sachs
(Single) oboes with cylindrical bore, with fingerholes
The air itself is the vibrator in the primary sense. The standing waves are significantly confined within the instrument itself. The column of air is made to vibrate by the intermittent access of an air stream produced by means of lamellae. The double-reed pipe has a reed of paired lamellae (usually a flattened stem), which periodically open and close, controlling the flow of air and a cylindrical bore. In the single-reed reedpipe, the column of air is made to vibrate by the intermittent access of an air stream produced by means of a [single] 'reed' consisting of a lamella which periodically opens and closes an aperture, controlling the flow of air. The instrument is tuned by altering the lengths of the air columns. With flexible air reservoir.
Cylindrical double-reed chanter with stopped end + cylindrical single-reed drone; flexible air reservoir