I ii V vi
etc.) or the Nashville numbers (1, 2, 3
etc.).
They are basically the same, only the type of writing differs.For example, if you change the mode from major (Ionian) to minor (Aeolian) in the key if "C", the "C" will change from the degreeI
degreevi
.
For example, if you change the mode from major (Ionian) to minor (Aeolian) in the key if "C", the "C" will be the degreeI
even after changing to minor.