00:00-13 – Buzzing into tuba leadpipe (no mouthpiece)
00:14-26 – Buzzing into back of mouthpiece (no tuba)
00:27-44 – Buzzing into back of mouthpiece (placed against tuba)
00:45-end – Buzzing into back of mouthpiece (into mute)
Buzzing, the primary technique by which brass players produce sound on their instruments, can be performed with the mouthpiece removed from the instrument, directly into the instrument’s leadpipe, or separate from the instrument or mouthpiece entirely. Buzzing on its own or into the mouthpiece alone typically assumes a precariousness of intonation, due to the lack of the instrument’s resonant tendencies. Buzzing into the instrument also assumes precariousness, but here it is because the embouchure required by the aperture of the leadpipe is small enough to excite extremely high partials that in turn suggest indeterminate pitch.
Whether buzzing into the tuba without the mouthpiece, or into the mouthpiece without the tuba, this soundworld is primarily a function of embouchure and air speed (lungs). Graphic notation is encouraged, particularly for the latter, given the inherent instability. Opportunities for amplification through hardware include: 1) placing the mouthpiece against (and thus exciting) the tuba, and 2) directing the sound into a (metallic) straight mute. The former gives considerably more body, the latter the impression of distance/reverb.