This is true. But did you know that by humming whilst doing this, brass players can also reproduce the third (always a major third, for some unknown acoustic reason, probably having to do with the length of tube being blown through) AND a seventh, which can be manipulated to be either M7 or min7 by scrunching up the corners of the mouth.
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Brass sections are thus only required for sad songs with minor chords in, but the musicians union insists on a full section anyway for all soul music, happy or sad.

