The Twelve-Stringed Lyre

The most elegant prose original: "Prosa"; refers to a liturgical sequence of Hermannus Contractus Hermann "the Lame" (1013–1054), an influential music theorist and monk. 159 and following.
Hermannus Buschius, a noble poet. 188
The musical setting Harmonia for heroic verse indicated. 188
Hesiod's poem on the nine Muses. 89
A passage of Horace in the Satires original: "Sermonibus". 85
Praise for the poems of Horace. 180
The Hypatōn, the first tetrachord a group of four notes with 4 strings. 10
The HYPERAEOLIAN Mode. 71 & 112
A fictional example of the Hyperaeolian Mode. 113
An example of the connection between the Hyperaeolian and Hypophrygian. 157
Examples of the Hyperaeolian in measured [mensural] song. 276 and following.
The Hypobolaeōn, the fifth tetrachord with 4 strings. 10
Why the Hyperiastian mode is so called. 78
The Hypermixolydian, an invention of Ptolemy; it has the same system scale structure as the Hypodorian. 66 & 67
The nature of the Hypophrygian Mode and examples in plainchant. 132 & 133
Examples of the Hyperphrygian in measured [mensural] song. 342
The system of the HYPOAEOLIAN Mode. 70
The nature of the Hypoaeolian Mode and examples in plainchant. 124 & 125
Intonations The melodic formulas for starting a chant of the Hypoaeolian. 126
How the Hypoaeolian is corrupted when changed into the Hypodorian. 103 & 125
Examples of the Hypoaeolian in measured [mensural] song. 320 and following.
The HYPODORIAN from A to a in the system. 66
The nature of the Hypodorian Mode. 102
The Hypodorian [turned] into the Hypoaeolian. 103
Why the Hypodorian is the second mode. 76
A true example of the Hypodorian in plainchant. 103
Various examples of the Hypodorian in measured [mensural] song. 242 and following.
The system of the HYPOIONIAN or Hypoiastian. 70
The nature and examples of the Hypoionian. 137
An example of the Hypoionian in plainchant. 137
Examples of the Hypoionian in measured [mensural] song. 354
The HYPOLYDIAN from C to c in the system. 66
Why the Hypolydian is the sixth mode. 76
The gravity meaning the low pitch or serious character of the Hypolydian. 93
The nature and example of the Hypolydian in plainchant. 114
Examples of the Hypolydian in measured [mensural] song. 280
The HYPOPHRYGIAN from B-natural ♮ to b. 66
The Hypophrygian cannot be divided harmonically referring to the mathematical division of the octave into a perfect fifth and fourth. 70
Why the Hypophrygian is the fourth mode. 76
The nature and example of the Hypophrygian in plainchant. 110
Examples of the Hypophrygian in measured [mensural] song. 234 and following.
The system of the HYPOMIXOLYDIAN or Hypiastian. 70
The nature and names of the Hypomixolydian. 120 & 121
The Hypomixolydian Mode was very pleasing to the ancient Church musicians. 70 & 120
An example of the Hypomixolydian in plainchant. 121
Examples of the Hypomixolydian in measured [mensural] song. 308 and following.
Hypotheses for the stretching of the Cithara strings. 56

I

Jacob Obrecht original: "Iacobus Ohrechth", composer Symphonetes. 256 & 456
Jacob Obrecht was the teacher of Erasmus of Rotterdam in musical matters. 296
The musical setting Harmonia of Iambic verse. 185
What imperfection is, and in which notes it occurs. 207 & 208
The Rule of Imperfection In mensural notation, the shortening of a "perfect" triple-value note by a third. 207 & 208
The three signs of imperfection. 210
Imperfection in music consists of the number two referring to duple meter or division. 200
An example of imperfection from Franchino [Gaffurio]. 208
Another example of imperfection from the same Franchino. 209
A third example of imperfection from the same. 210
The first example of uncertainty in measured music. 216 & 217
A second example of the same uncertainty. 218
A third example of the same uncertainty. 219
A description of the Boethian instrument. 44 & 45
The immense nomenclature of musical instruments. 46
Intonations of the common uulgarium modes. 36 & 37
What an interval is in music. 18
Fifteen intervals within the octave diapason are named by the musicians of our time. 18
The composition of intervals from tones and minor semitones. 18
From where the species types of intervals are derived. 23
Johannes Cochlaeus of Nuremberg, a theologian. 196
Johannes Olus, a Swiss, is praised. 367
Johannes Ostenheim is praised. 441 & 454
Johannes Ghiselin, composer. 215
Jean Mouton original: "Ioannes Mouton", composer to Francis, King of the French. 16, 296, 320, & 464
Jean Richafort, composer. 288
Johannes Vannius of Breisgau, composer. 304
Johannes Werner von Reischach, a prince of the Teutonic Order in Altshausen, is praised. 158
Which humorous Iocosae songs are approved. 468
Praise for Josquin des Prez original: "Iodoci Pratensis", who is commonly called Josquin. 362
The IONIAN or Iastian Mode and its nature. 115
The system of the Ionian or Iastian Mode. 70
Two examples of the Ionian or Iastian in plainchant. 116 & 117
An example of a "licentious" irregularly used Ionian in plainchant. 16
The Ionian Mode compared to the Dorian. 118
A certain example can be the same for both the Ionian and the Lydian. 130
The connection of the Ionian and Hypoionian. 158
A most beautiful example of the same in plainchant. 156
Examples of the Ionian or Iastian in measured [mensural] song. 288
An example of the connected Ionian and Hypoionian in measured song. 418
An example of the connected Ionian and Hypoionian with a major third ditono above, but not ending in its own place. 449
An example of the connected Ionian and Hypoionian ending like the Phrygian. 446
Isaac, see Heinrich Isaac. 331 & 197
A passage from Julius Pollux. 128
A tribute to Josquin original: "Iusquini" or Josquin des Prez. 243, 302, & 441