WATCH: Elton John and Jack White perform duet 'Two Fingers of Whiskey'

Watch footage from the series of their old-style blues duet below.

The upcoming documentary series American Epic will examine the early boom years of American music, when record executives began to travel to all corners of the USA, carting mobile recording equipment, to try and find the next great American musician.

Sound engineer Nicholas Bergh has reassembled a copy of one of these original machines, to record the music for the series and the accompanying film The American Epic Sessions.

The series premieres on PBS June 6.

The three-part documentary was executive produced by Jack White, along with Robert Redford and T Bone Burnett. The series will come with an extended companion soundtrack that includes a 100-song boxset, orginial archived recordings and studio performances from ‘The American Epic Sessions’. The soundtrack is out now, via Legacy Recordings, Columbia and Jack White’s record label Third Man Records.