BASIC AUDIO SETTINGS:
Zoom is designed for voice and compresses any other  audio to save on bandwidth, including musical instruments, which makes them sound terrible.  But there are settings to change so the sound won’t be compressed.
 
In older versions of Zoom:
 
1. There is an arrow next to “Mute” in the lower left hand corner of the zoom window - click that to go to Audio Settings
2. Uncheck "Automatically Adjust Microphone Volume" and manually adjust the level to the middle
3. Go to Advanced and select "...Enable original sound”
4. Select "disable" for "suppress persistent background" and "disable" for "suppress intermittent background noise”
5. And then back to the main Zoom page and look in the top left for the words “Turn On Original Sound”  and click on it [You want it to say “Turn Off Original Sound”]
 
In newer versions of Zoom: 

1. There is an arrow next to “Mute” in the lower left hand corner of the zoom window - click that to go to Audio Settings
2. Uncheck "Automatically Adjust Volume" and manually adjust the level to the middle 
3. Set "Suppress background noise" to Low
3. Go to Advanced and check "...Show in-meeting option to "Enable Original Sound"
4. Uncheck Disable echo cancellation
5. Check High Fidelity Music Mode
6. Set Echo Cancellation to Auto
7. And then back to the main Zoom page and look in the top left for the words “Turn On Original Sound”  and click on it [You want it to say “Turn Off Original Sound”]