How do you identify chords in Roman numerals?
Typically, uppercase Roman numerals (such as I, IV, V) are used to represent major chords, while lowercase Roman numerals (such as ii, iii, vi) are used to represent minor chords (see Major and Minor below for alternative notations).
How do you convert chords to Roman numerals?
In the case of transposing music, R. Ns identify the root of the chord within the key, so moving it to a new key is very simple. If a progression is: C Dm G Am, the Roman numerals will be I ii V vi. To transpose, you simply build new chords by finding the chord roots represented by the R.N. in a new key.