The (nearly) complete gamerip of Splatoon 3! Contains all music up to v8.0.0.

Disc 1: Multiplayer, Salmon Run, and Tableturf.
Disc 2: Splatfest
Disc 3: Story Mode
Disc 4: Side Order
Disc 5: Splatsvile/Inkoplis Plaza/Inkopolis Square
Disc 6: Multiplayer and Salmon Run layers/phases.
Disc 7: Splatfest layers/phases.
Disc 8: Story Mode layers/phases.
Disc 9: Side Order layers/phases
Disc 10: Splatoon 1/2 music.

If you want a simplified soundtrack, just download discs 1-4.