I think Charlie Parker is saying that music can be a way to show how you are as a person. I agree with him. I think that this could be used for other forms of music besides jazz because you can show who you are as a person while playing an instrument or performing.
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
