Module I
Physics and mechanics. How a lip buzz becomes a standing wave, and why the slide goes out to go lower.
plate i · anatomy
The trombone is one continuous tube wrapped to fit in your hands. You buzz your lips into the mouthpiece; that buzz sets the whole air column vibrating. The slide changes the tube’s length — and length is pitch. The F attachment reroutes the air through extra tubing, dropping the open horn a perfect fourth so you can reach the lowest notes.
the core idea
Extend the slide and the air column gets longer, so its lowest note drops a semitone per position — Bb, A, Ab, G, Gb, F, E. That is the whole reason the slide goes out to go down.
the air column, vibrating
harmonic 2 — 2 loops, 3 still points
the engine of brass
Without moving the slide, you change notes by changing how your lips buzz — waking up higher harmonics of the same air column. This is the overtone series, and it is the entire reason a trombonist can play melodies. Here it is, built on the open horn in position 1.
tap a harmonic
on the staff
The higher the harmonic, the more the air column subdivides.