Roblox audio

Two systems coexist:

• Audio API (modular, current): AudioPlayer → Wire → (AudioEmitter … AudioListener) → Wire → AudioDeviceOutput, with effect objects inserted in the chain. Required for voice-chat processing, mixing graphs, analyzers, text-to-speech/speech-to-text.
• Sound (classic, still supported): one object, parented to a part for 3D or to SoundService/UI for 2D; routed through SoundGroups with SoundEffect children. Fine for simple games and existing code.

Don't mix both for the same feature; follow what the project uses.

2D audio (music, UI) with the Audio API

--!strict
-- Client: build a music player once.
local SoundService = game:GetService("SoundService")