Where can one buy the soundtrack to the film O Brother Where Art Thou?

I have the same unanswered question. I take it, the score at the end of the movie is what most got you interested in the soundtrack, right? Well, at least it did me. Unfortunately, the only information I have is from searching both the opening credits and the IMDb website. I've gathered that,

Quincy Jones (Born:Quincy Delight Jones Jr.

March 14, 1933 in Chicago, Illinois, USA

received the Music By credit (opening credits from the movie), and

Toots Thielemans (Born:

April 9, 1922 in Brussels, Belgium)

is uncredited in the movie but performed what IMDb called a Harmonica Solo

Hopefully, this should be a good place for us to start finding the music if a soundtrack does not officially exist for Brother John. We can search Quincy Jones' early works (around and before 1971, the year the move was released), along with that of Toots Thielemans, to possibly compile the music score from the movie.

The question is: Did Quincy Jones score the music for the movie or did he adapt music he had already written? Often, existing songs/scores are adapted to a movie. Also, another important thing to remember is that artists who created original scores specifically for a movie will add them later to personal albums.

If I am not mistaken, this is what Ennio Morricone had done with his music from such movies such as The Good, the Bad and the Ugly, and Le professionel. Songs from such movies have been re-mastered or re-performed onto other albums such as the song "L'estasi DELL'oro" which can be found on the albums Un' ora con Ennio Morricone or Voci dal silenzio, as well as his music from the movie Le professionel. Songs such as "Chi Mai" and "Le professionel" subsequently were performed on his album Made in France.

By the way, if you are not familiar with Ennio Morricone, these three 'songs' are worth listening to:

L'estasi DELL'oro

Chi Mai

Le professionel

Cheers!