http://www.nytimes.com/2010/01/06/arts/music/06mitchell.html
The Willie Mitchell sound prominent horns, delicately strummed guitars, some sweet organ and a steady, straightforward beat is instantly recognizable on records by singers like Mr. Green, Ms. Peebles, Syl Johnson and O. V. Wright, and on the instrumentals Mr. Mitchell recorded as a bandleader. Both raw and sensuous, it became His signature sound as the label rose to prominence with Mr. Green in the 1970s.