Whistle tone (closed)

Whistle tone is produced when air moves slowly at very low pressure, like a gentle exhalation.

The vibrations occur at the lip plate rather than inside the tube, producing a high, thin sound.

NOTE: This notation is currently being updated, and two notation styles coexist at the moment — the one shown in the image (white diamond notehead) and another that respects standard rhythmic notation: a white/hollow notehead for half or whole notes, and a filled/black one for everything else, as in traditional notation.

In this case these are closed whistle tones. This means the pitch is determined by changes in fingering/position.