Pianist Johnny O’Neal is extraordinary, even if he isn’t as well known as other pianists around today. Influenced by Art Tatum and Oscar Peterson, O’Neal began as a gospel pianist in his home town of Detroit and spent the 1970s in Birmingham, Ala., working with local jazz musicians. In 1981, he relocated to New York to perform with flugelhornist Clark Terry and then became the house pianist at Birdland…