Would someone on here clarify these items on an academic syntax?

Many people mix these two terms.

Oka, a sinusoidal voltage wave source connected to a load which is Z= R +/- jX will provide a sinusoidal curent wave delayed by a certain degree amount dependent of the reactive ( passive) element on the specified load.

But talking about audio. what is the difference between group delay, phase shift and phase rotation?

For example, Micing a drum kit, the snare you do generally have :)