It's been over a year since Merle Haggard passed, but his legacy will always live through his music. From time to time even in never before seen or heard music...

Such is the case of Merle performing a duet with Willie Nelson included in a new documentary on PBS last night (June 6).

American Epic Sessions features a mixture of artists performing with vintage equipment. Willie and Merle paired up to sing “The Only Man Wilder Than Me,” from their final duets album, 'Django and Jimmie'.

A soundtrack titled American Epic: The Sessions will also be released this Friday, June 9th. You can even get a vinyl edition beginning June 16th.

Take a moment to check out their Duet performance of 'The Only Man Wilder Than Me' in the above music video!