The Twelve-Stringed Lyre

The false co-final, likewise the true clef. 31 A "co-final" is an alternative pitch upon which a piece in a specific mode might end.
What consonance is, according to two definitions. 23
The ratio and number of the ancient consonances. 24
The division of consonances according to the moderns neotericos; refers to Renaissance theorists who expanded on medieval ideas. 25
There are 5 perfect consonances. 25
There are 4 imperfect consonances. 25
How consonances are found on the strings of the Cithara. 59
The Crater likely referring to the "Crater" or mixing bowl mentioned in ancient philosophical/musical contexts. 43
The I Believe original: "Credo", in plainchant. 106

D

Damian de Góis, a noble Portuguese composer Symphonetes, is praised. 264
There are seven "deductions" [hexachord scales] of six voices. 6, 7, & 8
Three examples of deductions in measured [mensural] song. 220
A fourth example of deductions in measured song. 221
A fifth example of deductions in measured song. 222 and following.
A simple sixth example of deductions. 226
A demonstration of why it is necessary to establish 12 Modes. 75
The same judgment applies to octaves. A musical rule. 5
The corruption of the Dorian mode into the Aeolian. 119
Josquin’s song Out of the depths original: "De profundis" explained. 364
What the Octave Diapason is and from where it is named. 21
What the Octave System is. 66
How the Octave is definitely perceived in a 2:1 ratio original: "dupla ratione". 45
How the Octave with a Fifth [an eleventh] is found undoubtedly in a 3:1 ratio. 45
The twofold division original: "mediatio" of the Octave. 21
The Octave is cut in two into a Fourth Diatessaron and a Fifth Diapente. 68
Which species of the Octave are true and which are false. 68
The 12 species of the Octave are reduced to 7. 70
The 7 species of the Octave from A to g. 21
The 7 species of the Octave do not fill a double octave disdiapason. 66
The first species of Octave with two Modes: the Hypodorian and Aeolian. 102
The second species of Octave with its one Mode: the Hypophrygian. 110
The third species of Octave and its two Modes: the Hypolydian and Ionian. 114
The fourth species of Octave and its two Modes: the Dorian and Hypomixolydian. 117
The fifth species of Octave and its two Modes: the Phrygian and Hypoaeolian. 123
The sixth species of Octave and its one Mode: the Lydian. 127
The seventh species of Octave and its two Modes: the Mixolydian and Hypoionian. 133
The FIFTH Diapente, the perfect fifth, with its species. 20
How the Fifth is definitely perceived in a 3:2 ratio original: "sesquipla ratione". 45
Which species of the Fifth are common to which Modes. 139
The Fifth with Tones and Semitones attached. 171
The first species of the Fifth, Re-La, in plainchants. 167
The second species of the Fifth, Mi-Mi, in plainchants. 168
The third species of the Fifth, Fa-Fa, in plainchants. 168
The fourth species of the Fifth, Ut-Sol, in plainchants. 169
The first species of the Fifth, Re-La, in a figured [polyphonic] example. 430
The second species of the Fifth, Mi-Mi, in figured examples. 432
The third species of the Fifth, Fa-Fa, in a figured example. 434
The fourth species of the Fifth, Ut-Sol, in the "soft-B" [conjunct] tetrachord Synemmenis and in a figured example. 438
A figured example of the same in the "disjunct" tetrachord diezeugmenis. 439
The Diaschisma, half of a diesis. 28 & 27
The FOURTH Diatessaron, with its species. 20 & 23
How the Fourth is considered a consonance today. 25
How the Fourth is known to be truly in a 4:3 ratio original: "sesquitertia". 45
The three species of the Fourth in plainchants. 165
The 24 connections of the Fourth and Fifth create 12 useful species of the Octave. 68
The 3 species of the Fourth, and which are common to which Modes. 139
The Diatonic, the first genus of melody. 9
The Diesis, that is, the minor semitone. 28 & 27
The twofold meaning of the Diesis. 28 & 27
The Disjunct [tetrachord], the fourth tetrachord Diezeugmenon, with its four strings. 10
Differences in the formulas [melodic endings] at the boundaries of the modes. 40 & 41
A little digression into the habits of singers. 113
What "Diminution" is among musicians. 205 & 206
Various rules for diminution. 205 & 206
An example of diminution from Franchino [Gaffurio]. 206
The Discant Discantus or Soprano voice is praised. 239
The Double Octave disdiapason, the greatest system in music. 10
What kind of system the Double Octave is. 66
How the Double Octave is truly found to be in a 4:1 ratio. 45
What dissonance is. 24
Six dissonances within the double octave. 26
The Ditone, the perfect third In the Pythagorean system Glarean references, the "Ditone" is a major third made of two whole tones. 19