FLUTE

The air stream must be directed at the correct angle and velocity, or else the air in the flute will not vibrate. A study in which professional players were blindfolded could find no significant differences between instruments made from a variety of different metals. In two different sets of blind listening, no instrument was correctly identified in a first listening, and in a second, only the silver instrument was identified. The study concluded that there was "no evidence that the wall material has any appreciable effect on the sound color or dynamic range of the instrument".
In its most basic form, a flute can be an open tube which is blown like a bottle. There are several broad classes of flutes. With most flutes, the musician blows directly across the edge of the mouthpiece, with 1/4 of their bottom lip covering the embouchure hole. Flutes can be played with several different air sources.