Here comes some acoustics.
The velocity of sound is faster for lighter molecules. This
can be found in textbooks of college physics. If you play a
trombone with H2 (hydrogen) it may sound like a trumpet because
the wavelength cannot change (determined by the size of a trombone)
so the frequency changes to increase the velocity of sound.
Take a deep breath and play your instrument. The pitch is
sharper at first and then drops down. The reason is similar.
The more fresh air has more O2, the later air has more CO2 and CO2
is heavier than O2 so the pitch drops later. It has nothing to do
with the quality of player.
This becomes crucial if you have to play some important passages.
For example, take a deep breath and play the opening of the 2nd mov.
of Mozart clarinet concerto right away, the effect is so significant
(can be 20% of a half note) that you will be criticized by any
good musician.
So, wait for 2 seconds, burn the O2 out, then play that passage.
This gives a more stable long note (pitch-wise).
If the first note you would like to play is sharper then the
tendency of your instrument, then take a breath and play it right
away, that helps a lot!
For those who don't believe me, Karl Leister teaches his students
this trick, too. So does Antony Pay. (never call him "Anthony Pay"!)
Hsuan-Yi Chen
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