On this subject, I have tried to install this extension in both MakeCode Arcade and Microbit. It shows up at the bottom of the list of tools under “music” and will not activate in Arcade but might in Microbit:
Arcade: https://makecode.com/_6CybxPcigJfq
Microbit: the editor does not cry when I click on the extension here under music so it might work: https://makecode.microbit.org/_WyxDrA0kAReJ