Jazz Up Your Event Pianist/Singer Performs Elegant, Swinging Jazz. Singer Pianist Jonathan L. Segal performs jazzy versions of “The Great American Songbook” at events all over the New York City area, including the music of Gershwin, Cole Porter, Irving Berlin, and other great songwriters from the stellar age of American song. He brings a sense of joy and fun to the kind of swinging songs that you’ve heard sung by Sinatra, Tony Bennett, Harry Connick and Michael Buble.