well a lot of his tracks have a different feel to me .
when 40 engineer's ...his tracks they sound mopey
(most of the time its : low synth, piano, snare, a sample that has been warped , etc)
when its boi-1da, etc producing its more of a club/party feel.
(big distorted 808, brass, catchy chord/melodic progression, warped sample, good drums/percs etc..)
most of the time when i make a 'drake type' . i start working on a melody for the low synth. then keys and so on .