You may laugh but "H, R, N, K" are the note names for my quadrotonic scale which I totally invented and am in the process of developing an entirely new style of music around.
As we all know... if you play the notes "in between the notes" of the diatonic modes you produce the pentatonic modes.
In "HRNK" theory we randomly remove a single tone from said reversed diatonics (aka: the pentatonic modes) and go apenoodles freeform style until precious bodily fluids are released (whether by the performer or the listener).
IT'S THE NEW MUSICAL SENSATION*!!!
*bringyourownmop