'Public Enemies' Trailer with Otis Taylor

Michael Mann always had an uncanny ear for the music he puts in his movies, getting Tangerine Dream to score 'Thief', or putting Mogwai tracks in his remake of 'Miami Vice'. With the second half of this new trailer for 'Public Enemies', Mann is almost invoking an 'O Brother Where Art Thou?' atmosphere with the rambling bluegrass and old-timey setting (see the 'O Brother' trailer here). Of course, 'Public Enemies' is more serious in tone, but the end result is strikingly similar. Embedded below is the track used in the trailer, Otis Taylor's "Ten Million Slaves". Otis' website refers to his style of music as Trance Blues (rather than Bluegrass) and I think that fits well; the music is hypnotizing.

And I can't tell if the music in the first half of the trailer is another song or original scoring, so if anyone recognizes it, leave a comment.