Audio
Audio[docs.unity3d.com]
Create a new empty GameObject and add the component VRC Spatial Audio Source. This will automatically add an Audio Source component.
If it is world music, uncheck enable specialization.
To compress the audio, set the compression format to Vorbis, and adjust the slider lower for more compression.
If the audio is spacialized, check "Force to Mono".
VRC Spatial Audio Source Documentation
Audio-basics-crash-course[ask.vrchat.com]