i remember that i noticed this interpolation around the time of alpine/deer creek (the interpolation didn't happen at alpine though) and i've just put off trying to figure out what song it was the were interpolating.
anyway, its Parliament's "Up For the Down Stroke"
the horns interpolate it during tim's solo.
the problem is, they haven't done it on all of the 09 jimi's, but just a few i believe. what made me remember that i knew that hornline from somewhere was listening to last night's tape.
for a vast majority of tim's solo, rashawn and jeff play a hornline derived from the actual words "get up for the down stroke.. everybody get up"
if you click on the youtube link and have last night's show downloaded you'll immediately know what i mean.