Overworld Day is permanently seared into my brain. Scott Lloyd Shelly built Terraria's entire musical identity from this catchy, upbeat guitar riff that somehow never gets old after hundreds of hours. Underground flips the whole mood with these echoey, crunchy synth lines that make spelunking feel genuinely eerie.
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Then Plantera drops and suddenly you're in a prog rock boss fight. The Hallow's theme is so bright it almost feels sarcastic given how deadly that biome gets. Moon Lord closes things out with this massive, layered composition that actually matches the scale of fighting a cosmic horror.
If you've ever dug straight down on your first night, you already know these tracks by heart.