
"Bohor, orignally for eight channels, is a radical exposition of these issues [the exploration of of scales of transitions between different timbres and degrees of sonic activity], being in effect a single, slowly evolving gesture lasting close to twenty-two minutes, It is, as Xenakis states [in the liner notes to a recording of the piece released in 1970 on the Nonesuch label], 'monistic with internal plurality, converging and contracting finally into the piercing angle of the end.' There are two basic textures:there is an additional paragraph on the reception of the piece, by pierre schaeffer (director of the groupe researches de musique that sponsored the composition; schaeffer hated it) and audiences who were and would've been shocked at the volume of the piece in performance.The low sounds are heard twice (aside from the opening sonority, lasting just ten seconds, and a few other occasions at very soft dynamic levels), beginning at the 5'30" mark, and lasting about 8 minutes, reappearing after the 17'00" mark to last just 1-1/2 minutes. The other sonority continues throughout, adding layers, one by one, until there are several sounding simultaneously. The density of each one builds and subsides independently, producing an incredibly thick, constantly evolving texture that seems to have no linear trajectory. When the sustained sound drops out the first time, there is a noticeable drop in intensity and tension, but the metallic sounds build up again, leading at the end to a sublmation of all the othe rlayers to the noisiest, crashing sonority, which sharply boosts its mass and dynamic level over the final three minutes." (harley 20-21)
- A concentrated, teeming sonority, constantly in motion, ranging in timbre from bell-like sounds (filtered to muffle the resonance) to metallic rattlings, finer-grained metallic sounds closely resembling the charcoal crackles of Concret PH, and noist clashings and crashings;
- A low, sustained sound adapted from recordings of a Laotian mouth organ, the characteristic crescendo-decrescendo and breaking off for breath being preserved.

columbia clearly has access to materials and media that harley's print work cannot compare with; likewise he surveys xenakis' complete career. so ultimately it's not a matter of choosing one of the other, but the columbia project online is quite impressive.
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