Zoom applies processing on your microphone audio to apply voice enhancement, but this isn't what you want for live music!
These methods below are Desktop client only.
There will now be button to 'Turn on Original Sound' shown at the top left of the meeting window. This can be toggled whenever needed.
(the optional dropdown menu has advanced options)
I am told that the 'Simple Method' above will still have vocal compression/codec applied. So a better way to send through your live music is via 'Share Computer Audio' but you'll need to figure out the technical details to get your music audio 'in'
If you have an audio interface, you also want this method.
See ZOOM AUDIO FOR RICE MEETINGS.pdf (TODO summarise here)
If your participants can't hear no sound, you may need to reinstall your audio driver (on Windows).