My favorite (and quite possibly the greatest) NES song of all time. The man behind the music is Tim Follin, an underappreciated composer of killer tunes for a bunch of retro games. If this sounds a bit prog rockish to you, that's because it is - Tim listened to a lot of progressive rock growing up and was thus heavily influenced by it (lucky for us). This and a lot of his other tunes are basically prog rock songs but composed for video games. He's one of the only oldschool game music composers who made music like this.