I'll second you on Dio. He and wife Wendy were/are two of the nicest "show biz" folks I had the pleasure of meeting and working with back when I was in management/PR.

Do you mean Shiela E? Both worked with Prince extensively and had already launched careers prior to collaborating with him. Of the two Sheena had more hits under her belt before working with Prince and mostly co-wrote w/ him. Shiela E had more of a mentor/protege arrangement and was signed to his Paisley Park label.