What or who am I, I suppose, is reasonable to ask. However, the answer is not about a person, and not a proper noun, which who, implies. Even though there are some proper names connected with some of these clues, they aren't the underlying theme.
The Bill Withers song is "Ain't No Sunshine" [I know] if that helps any, George? But I doubt if it would help you. That part of the clue is probably the most obscure of them.