He is first to be heard at the age of 2 in the original recording of "Goodbye Blue Sky" from the famous Pink Floyd's album The Wall. Before the music starts, the song opens with him saying "Look, mummy, there's an aeroplane up in the sky".
Harry is also a British piano and Hammond organ player who has played keyboards with his father's touring band on the In The Flesh tour since 2002. In 2004, he toured with Marianne Faithfull and the Ozric Tentacles. Some demos of his jazz work in collaboration with saxophonist Ian Ritchie (also playing for Roger Waters) are available from his father's website. The formation was called the Harry Waters Quartet.
In November 2008 the first Harry Waters Band self-titled album was released.