I
Interval
1 - The difference in pitch between two tones
2 - A break in a concert
Intonation
The difference in pitch between your instrument and the ideal. Playing with good intonation is being "in tune"
Intrada
A prelude
Inversion
1 - Chord played a degree of the arpeggio higher
2 - Melody turned upside-down
J
Jazz
A musical style developing in New Orleans in the early 20th century, which combines elements of African, European and American music
Jeu de timbres (Fre)
Glockenspiel

Jubiloso
Jubilant
Jump swing
Form of jazz: very fast swing. There is a resurgence of this dance style across the world today
Jusq'ā la fin (Fre)
Until the end
K
Keyboard
A piano, or any instrunment with piano-like keys
Key signature
The sharps or flats placed at the beginning of the staff or stave to denote the scale upon which the music is based
Kick drum
The lowest drum of a drumkit, operated with a foot pedal
Kit
Shortened term for drumkit
Kräftig (Ger)
Vigorously