i'm sure it's a mix of live players and samples. the samples are often
credited (barkays' "fighting fire w/fire" [used for "gettin' into it"]
and boz scaggs' "lowdown" [used for "the reason"] come to mind first), and
if you check "when the funk swings" that's gotta be live players, not even
dj shadow can edit jazz samples that well...
-t