Some time ago, I made a long post about Miles Davis and the "Kind of Blue" recording and why it was important in jazz circles. Rather than try to recap what I wrote, here is the link to my old post:
http://forum.audiogon.com/cgi-bin/fr.pl?rmusi&995231381&read&keyw&zzkind=of=blue
http://forum.audiogon.com/cgi-bin/fr.pl?rmusi&995231381&read&keyw&zzkind=of=blue