Like when you play a game with background music and you KNOW you'll remember it because it's so awesome, maybe because it fits the game really well or just because it's catchy as fuck?
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Nfs Underground 2 - Riders on the Storm (Snoop Dogg)
Roller Coaster Tycoon 2 - Caroussel themes
Terraria - Daylight theme
Simcity 4 - Traffic Jam theme