My Fifth Round!
1) Music from a video game that people wouldn't be able to tell is from a video game just by listening to it
World Of Goo - Brave Adventurers
World Of Goo was the very first indie game I have ever played and a game that introduced me to the world of indie games in general. For anyone unfamiliar with this game it's basically a physics-based puzzle game where you build towers and bridges made out of different types of cute little goo balls with different abilities and effects in order to guide the goo balls not used into pipes, and it all occurs under a sinister plot from a newly formed corporation on their seemly peaceful world. I can't recommend this game highly enough, and this track is one of the most memorable for me and it's hard to believe it's not only part of a video game but part of a video game basically made by two guys.
2) A really creepy/scary track from a game
Paper Mario: The Thousand-Year Door - Riddle Tower
Note: You really only have to listen up to around the 1:25 mark to get the general idea.
This is one of my favorite video games of all time so I really can't resist having another answer related to this game
Seriously though this track is extremely creepy not only on its own but it's also fairly creepy for a Mario game. I could go into more detail as to what makes this music track even more creepy but to prevent spoilers I'll put it into a spoiler tag:Spoiler
You explore the final dungeon of the game only to suddenly come across this huge underground city looking area with the Riddle Tower in the middle. The fact that the existence of this tower is left completely unexplained in the game even though you are almost certain it has some strong connection with the lore of the Shadow Queen, makes this specific music track even more creepy and makes it really highlight the unknown factor.
3) A track from a video game you wish you could forget so you could hear it again for the first time
Mega Man 7 - Wily Stage 1
I mentioned this track in Round 1 and I'm going to make it an official answer in this round for one main reason. When I played Mega Man 7 for the first time I was in a very sour place in my life and I don't remember much of the Wily stages only that they made me rage quit constantly which for me to even get angry at all in a video game now-a-days is rare. Unfortunately, because of this I was unable to fully grasp what an amazing tune this was when I arrived at this stage for the first time. I'll gladly forget about it and listen to it again for the first time, and actually I'll love to forget my first experience with the entire game and play it again blind because it is a very enjoyable game and I'll hate to have such a down moment in my life completely ruin it.
This is a track that plays in a horror game that starts off as an innocent looking pizza restaurant tycoon kind of game only to quickly show a dark side not only during the office section (being stuck in a very small office space trying to make sure nothing "undesirable" crawls into it via air vents as you work), but also in the form of little Atari minigames that are a stable of the entire series that serves to hint at lore going on in the background. This track plays during one of those minigames that starts off as a racing game. It's very uplifting and fast paced and serves as a nice break from the rest of the game.

I also really love that Frogger one with all the little different animal sounds in the background as it really seems to fit the game itself. I also really like that Four Swords Adventure one, and I've actually never played that game. I've never even heard anyone talk about it that much even when the game was released. Your comment on it is honestly the first real thing I heard about it
but the ones that I have I've always LOVED the music so much and this credits track you posted is no exception. Amazing. The Cocoto Kart Racer one sounds very nice as well, and despite it being a racing game it sounds very relaxing as well. Finally, that final boss track is indeed epic. It's such a fast paced song that it really gets you pumped up.