Bruce Willis is known for his roles as a cop, assasin and military man, but also plays an instrument. Which one?

Explanation

Bruce Willis (born 1955) is an American actor. His break through came with the series 'Moonlighting' where he played the private detective David Addison. Willis has acted in a long list of films, including 'Die Hard' (1988), 'The Last Boy Scout' (1991), 'Pulp Fiction' (1994), 'Twelve Monkey' (1995), 'The Sixth Sense' (1999) and 'Sin City' (2005). Willis is nick-named Bruno, plays the harmonica and used to be married to Demi Moore.