I'm not sure what the original music was, I'd be concerned about accidental music plagarism. I know a Youtube license is pretty loose. Be sure to reference the original music or someone may think you haven't properly accredited the original authors.
What do you mean exactly? While these are my own original compositions and I didn't really try to imitate anybody, I know that they may sound similar to some of the older video game soundtracks. But that's because they are influenced by music I remember from my childhood.
Anyways - thanks for your feedback! I'll make sure that my compositions aren't just copies of already existing ones.
To me, Megaman II's sound track is definitive of what the NES could do. It's also got its own character as far as construction of songs,scales and melodies. Dress it up in any kind of instrument/remix and it still sounds like megaman 2.
I had to play the game after your post. The soundtrack is great. Especially for the NES!