Listen to I Know That You Know online. I Know That You Know is an English language song and is sung by Art Tatum and Gene Norman's "Just Jazz". I Know That You Know, from the album Art Tatum from Gene Norman's Just Jazz / Gene Norman's Just Just Jazz Vol. 3 / Frank Bull and Gene Norman's Blue Jubilee, was released in the year 1953. The duration of the song is 2:43. Download English songs online from JioSaavn.