"D, F & Bb are indeed the next three of "the big six" (A, C, D, G, F and Bb, in that order)" True...but I wouldn't leave E out of your purchasing plans. It can be a very useful harp for playing both straight harp and cross when you're playing blues in B. Hawkeye Kane hawkeyekane@xxxxxxxxx Cell: (217)-741-7183 http://www.hawkeyekane.com/