Gold record
From Inkipedia, the Splatoon wiki
Gold records are collectibles found in Alterna in Splatoon 3's single-player mode, Return of the Mammalians. When collected, they add elements to the background music for each site. Each site has three gold records hidden in Loot Anchors. When all gold records for a site are obtained, a completion icon is added to the map screen.
Gallery
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Getting a gold record