Jon Lord (‘Deep Purple’) gives a demonstration on how he got his signature sound, and demonstrates it playing the organ solo from ‘Highway Star’.
Billy Preston on the Hammond B3. Includes imitations of J.S. Bach and Ray Charles. SOund quality isn’t great, but still worth watching.
Tony Monaco is a great Hammond A-100 player with a winning personality, who shares a lot of interesting information for organ players. You can also find some cool instructionals on his web site.