Forgot to add VInnie Moore to the above... he is truely an amazing player, very versatile on the sweep picking. If you doubt me, check out the MP3's on his website and download "Defying Gravity"... there will be very few players on the planet who can play those sequences as clean and as fast. Most of the players in the previous post have done articles for various magazines on this subject. Check them out, there are no better players to aspire to for this technique.