I went ahead and recorded the entirety of the Contra 4 score, via the in-game sound test mode. The soundtrack is available for download in a .zip file on Megaupload:
I'd love to hear more opinions on the music. Personally, I thought Kaufman did a fantastic job, expertly combining the more memorable and edgy melodic hooks from the original Contras, with his own compositional spin. Love the direct throwback to the Base battle theme in "Tunnel Boss," and the final stage suite brings back the dramatic flair of Contra III. The new Jungle theme, dubbed "Jungle 1" and based on his original "Vile Red Falcon" chip composition, easily finds its way into the Contra Theme Hall of Fame.