Listen to You'll Have to Prove It to Yourself online. You'll Have to Prove It to Yourself is an English language song and is sung by Roger Goula. You'll Have to Prove It to Yourself, from the album Inspector George Gently Series 8: Gently Liberated & Gently and the New Age (Music from the Original TV Series), was released in the year 2017. The duration of the song is 4:04. Download English songs online from JioSaavn.