Classic, doom-laden, blues with attitude, Historical sounding, authentic / genuine blues guitar from a bygone era, Think 'O Brother Where Art Thou'; history / retro, perhaps New Orleans / Southern / probibition era.
Wistful country rock, Americana. The tempo picks up at about 00:45. Slightly bluesy - develops into more of a blues-rock with slide guitars etc. Very American sounding. Also available as an Underscore version, without the lead instruments.