abbreviations
"Tr" - a traditional, usually academic definition or symbol
"Ex-" - example

ABCDEFGHIJKLMNOPQRSTUVWXYZ

JOY SYNDROME (THE)
A form of chord stagnation during 2 cells (such as I / I, V / V) named from Joy To The World, bars 12-15

JORDAN TRIANGLES
A form of diagram which represents both Vertical and Horizontal Harmonic relationships at the same time

JUST INTONATION
The normal and intuitive choice of all "flexible tuning" instruments. see Intonation