Contra: Hard Corps has a amazing soundtrack! I don't really have any favorites of it yet because unlike Mega Man or Castlevania, I haven't played them so many times to where I memorized the whole soundtrack and can easily pick out my favorites. I only beat this game twice at the time of this post, so I'll update this when I've beaten the game at least five times. As for the game itself, it has great stages with fun setpieces, fun bosses that are extremely hard, multiple different endings (Some of which are pretty damn weird), and Four different playable characters with their own weapons to use. Overall, Contra: Hard Corps is a great game that is extremely hard.
Soundtrack: 8/10.
Game: 7.7/10.