Final Fantasy VII
(One Winged Angel)
Super Mario Bros
(Ground Theme)
Halo: Combat Evolved
(Main Theme)
Mega Man 2
(Entire OST?)
I feel like the first three are objectively correct, I am not sure about the 4th slot but Mega Man 2's entire OST feels iconic enough to where its the answer maybe? The other three games just have songs that are basically drilled into the brains of anyone that's even approached a video game.
https://i.gyazo.com/6fde58a9d13e1f9272a6d6eab35bcff7.png