Instrument /'ɪnstrʊm(ə)nt/ (n)
a device for producing musical sounds by vibration, wind, percussion, etc
Instrumentalist /ɪnstrə'mɛnt(ə)lɪst/ (n)
a player of a musical instrument
Interlude /'ɪntəl(j)uːd/ (n)
a piece of music played between other pieces or between the verses of a
hymn
Interval /'ɪntəv(ə)l/ (n)
the distance between two notes
Introduction /ɪntrə'dʌkʃ(ə)n/ (n)
the opening section of a piece of music; overture
Inversion /ɪn'vəːʃ(ə)n/ (n)
the act of inverting an interval, chord, or phrase; an inverted interval,
chord, or phrase (in relation to the original one)
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Invert /ɪn'vəːt/ (v)
change the relative position of the notes of an interval or chord by raising
the lowest note by an octave
Key /kiː/ (n)
a group of notes based on a particular note and comprising a scale,
regarded as forming the tonal basis of a piece of music; a system of notes
definitely related to each other, based on a particular note
Key signature /kiː 'sɪgnətʃə/ (n)
any of several combinations of sharps or flats after the clef at the
beginning of the staff, indicating the key of a piece of music