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.

Instrument - Any device that produces a musical sound.

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

Interval - The difference in pitch between two tones.

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.

Ironico - Ironical.