for years is to tap into a FELLING of a past song and try to recreate that feeling.

Some of his productions are more obvious like "Hot in Here = I Feel Like Bustin loose" or "Diddy = Jimmy"

Some more subtile, like tapping into chord progressions in previous hit songs or moods and applying it to productions (I've heard Phrarell mention he used alot of the same keys used on Reasonable Doubt to get Jay going when producing for him).

It's just that somebody (Marvin Gaye's estate) called Pharrell out on it this time..