Copies the song/SFX ID for any given song/SFX cell.
Could also copy multiple song IDs or multiple SFX IDs if need be.
It's that simple, really.
For levels with multiple songs or SFX assets, press that blue "i" button in a level's song widget to open the Assets Browser for the level!
Rewrite + continuation of Copy Song ID, whose developer has retired from Geode modding (as of writing this) for a number of reasons not worth discussing here.
This Geode mod is licensed under LGPLv2.