Octave species various available intervals could be combined in any order, even restricting species to just the diatonic genus would result in twelve ways of dividing the octave (and his 17th-century editor, Marcus Meibom, pointed out that the actual number is 21), but "only seven species or forms are melodic and symphonic" . Those octave species that cannot be mapped onto the system are therefore rejected . In chant theory beginning in the 9th century, the "New Exposition" of the composite treatise called "Alia musica" developed an eightfold modal system from the seven diatonic octave species of ancient Greek theory, transmitted to
How to Have Sex in an Epidemic MSM in New York City and San Francisco had been infected. Retrospective analysis by the CDC found that there were between 250,000-300,000 people living with HIV in the United States in 1983, and the number of people newly infected between `83-`84 was around 150,000). However, the model set forth by Callen and Berkowitz at least provided the possibility of a "return to intimacy" for people with AIDS, which, despite being based on a now-defunct notion of how the syndrome arose, was important in combating the social death that many PWA faced after diagnosis. "How to Have Sex in an Epidemic"