Metal Gear 2: Snake's Revenge has been maligned a bit over the years, as it was not worked on by the same team as the first, and even Hideo Kojima has slighted it in interviews. That doesn't mean it wasn't fun, or that the music didn't have some choice tracks. The "Jungle Base" theme, while not nearly as awesome as Metal Gear 1's, is still pretty slick, and I took it to a more orchestrally-electronic pitch.
from Gamey Mixture,
released September 10, 2010
Source: Metal Gear 2: Snake's Revenge (NES), "Jungle Base", by Kazuki Muraoka.