In an article promoting this weekend's three-night Lincoln Center gig for drummer Jimmy Cobb, the lone surviving person present at the recordings sessions that became Miles Davis' inconic "Kind of Blue", Bloomberg News got him talking about the 1959 dates at Columbia's 57th Street studio:
"Some of the songs weren’t written out completely. Cobb said Davis kept tweaking their structure throughout the recording sessions.
"'I didn’t even have sheet music,” Cobb said. “Miles had the chord changes and song’s structure written on paper as notes.'"
Read the article here: http://www.bloomberg.com/apps/news?pid=20601088&sid=aLRnuSJuIrAA&refer=muse