Listen to Let's Duet from ''walk Hard: The Dewey Cox Story'' (Instrumental Backing Track) online. Let's Duet from ''walk Hard: The Dewey Cox Story'' (Instrumental Backing Track) is an English language song and is sung by Original Backing Tracks. Let's Duet from ''walk Hard: The Dewey Cox Story'' (Instrumental Backing Track), from the album Karaoke Hits: Essential Soundtrack, was released in the year 2013. The duration of the song is 3:32. Download English songs online from JioSaavn.