http://www.youtube.com/watch?v=3Z2vMBuOxFM Jaylib - The Red off J Dilla and Madlib's collab album.
http://www.youtube.com/watch?v=3Z2vMBuOxFM Just because it's a great Dilla song.
Wow so hard to answer this...definitly best producers would be RZA, Dre, DJ Premier, Madlib, J Dilla, Kanye
I'm a big fan of piano in beats ...the red is definitly up there, umm scarface - on my block, forgot about dre & still dre, a bunch of songs from illmatic could vie for it, some songs from reasonable doubt, ohh those random ill premo songs like crack attack, recognize...oh shit also mobb deep shook ones part ii, survival of the fittest
haha definitly a lot I'm missing