I

The.

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Idyl

A short poem in pastoral style.

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Il

The.

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Il fine

The end.

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Imitation

Repetition of a theme, motive or phrase introduced by one part, the antecedent, in another part, the consequent. An essential elemant of contrapuntal style.

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Imperfect authentic cadence

An Authentic cadence which has the third or fifth in the soprano in the tonic triad. More about cadences.

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Imperfect plagal cadence

A Plagal cadence in which the soprano note is changed in the progression IV-I. More about cadences.

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Impressionism

A musical movement of the late 19th and early 20th centuries. Inspired by the French impressionist painters, the movement had its impetus in the music of Debussy and Ravel.

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Instrument

Any device that produces a musical sound.

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Instrumentation

The art of composing, orchestrating, or arranging for an instrumental ensemble.

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Interval

The difference in pitch between two tones.

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Inversion

As applied to music the term may be used in both melody and harmony. Melodic inversion: an exchange of ascending and descending movement, e.g. c up to f in descending becomes c down to g. Harmonic inversion: the position of the chord is changed from root position (root on the lowest pitch) to first inversion, with the third, or second inversion, with the fifth in the lowest voice. An example: root position c-e-g; first inversion e-g-c; second inversion g-c-e.

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Ironico

Ironical.