Alright Hooman, you're correct. It IS AOE 1. Assign yourself whatever amount of points you've been using for everyone else. AOE 2/3 did NOT use any remixes of their predecessor's songs.
+ 10000000 points for Hooman! (j/k)
Some clues:
Number 1 is from a fairly common game. It was game of the year. I'll reveal what year on Monday. There where 3 incarnations of this in total, but each sucked more then the first. It at its time, was considered revolutionary. The song is from the game's tutorial.
Number 2 A/B is from a game I've talked about on IRC. It was never particularly common, and was criticized for being too close to Wing Commander, but still had fairly distinctive game play.
Number 4 is from a game that lasted on count, 5 separate incarnations, including expansion packs. Another not particularly well known game, it does have a fairly good following, large enough to warrant 4 sequels. This song appears in 3 of the games, the first, third and fourth. I do not believe they ever bothered to remix it.
More specific clues will appear throughout the week, whenever I get around to posting them.