Make a sculpture that whistles in the wind

Motivation
Artistic expression.

Understanding
When the wind blows over the end of a tube it can make a whistling sound. The direction of the prevailing wind is the direction that the wind normally blows in for the majority of the time.

Method

 * 1) Find some open-ended metal tubes.
 * 2) Stack them however you wish such that the open ends of the pipes protrude outwards.
 * 3) Angle the sculpture relative to the prevailing wind such that it makes the most clear whistling sound.