This is a special effect, since they can produce the same note 'properly' elsewhere on the instrument. String players can press their finger more lightly on the string in certain places to produce harmonics. Other harmonics can be produced as a special effect if the player blows harder still. If they blow a little harder, they produce the notes an octave higher (eight notes higher), which is the first harmonic in the series for each pitch.
The more fingers they put down, the longer the tube. Woodwind players also produce their notes by blowing down a tube. Trombones are different, in that the tube is extended with a slide, not valves. If the player presses down the valves, the tube becomes longer, therefore producing a different fundamental and a different set of harmonics. The lowest note they can produce is called the fundamental, and then they blow harder or softer to produce the different notes/harmonics present above that fundamental. Most of brass players' notes are harmonics. Harmonics are present in every note, but using the following techniques, we can actually produce them by themselves.
Harmonics - light, feathery sounding notes, produced in different ways by different instruments.
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