I have listened today to Bernstein's score; it is perhaps the most silly and inappropiate music ever composed for a film that I've heard (along with "Ladyhawk"). No wonder that Walter Hill, with sound judgement, rejected such a mess. It is no surprising as well that you cannot see Cooder's triumph if you regard this rejected score as greater. They simply have got nothing to do with each other; they belong to different worlds.

By the way, electric guitars existed as early as 1931, in case you didn't know.

To sum it all up, I completely disagree with you.