A Treatise on Byzantine Music

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ...tetrachords, and one diminished fourth tetrachord; of the chromatic genus, one minor fourth tetrachord; and of the compound genus, the first two major fourth tetrachords of Example LI., as follows: --EXAMPLE LXXXVL 3 2 13 14 9 5 1 176. Only for the presence of the two compound tetrachords Nos. 13 and 14, the following family would claim, from the fact of possessing the three consonant diatonic minor fourth tetrachords, a higher degree of purity than the two families immediately preceding. 177. Class 10, which requires for its normal definition four sharps (c, g, d, and a) or one flat (g), consists of the same generic order of tetrachords as Class 9, though not of the same individual instances: Nos. 6; 8; and the third and fourth tetrachords of the compound genus at Example LI, Nos. 15 and 16, taking the places of Nos. 5; 9 j 13, and 14: while Nos. 1, 2, and 3 remain unaltered, as follows: --178. This family, being its true correlative, has the same claim to superiority as Class 9 over its two immediate predecessors at Examples LXXXIII. and LXXXV. 179. Class 11, which requires for its normal definition three sharps (c, d, and a) or two flats (a and G), contains, of the diatonic genus, two minor fourth tetrachords (No. 2 being omitted), and the two diminished fourth tetrachords; of the chromatic genus, one major fourth tetrachord; and of the compound genus, the first two major tetrachords of Example LI., as follows: --EXAMPLE XC. 6 5 13 14 11 1 3 180. We are here less influenced than in Classes 9 and 10 by the consonant diatonic minor fourth tctrachords, and consequently have lost somewhat more in purity. EXAMPLE XCI. Class 11. 181. Class 12, which requires for its normal definition two sharps (g and a) or three flats (e, D, and G), consists