Not sure Paul about turning it off. But I can tell you I never loaded their app on my PC. Yet I was able to upload individual files just fine and do all other functions too. I think the deal you loaded is meant to back the PC up to cloud possibly. Not sure as again, I do not run anything.
The only thing I am not sure of with Google drive is the sharing out of say a folder of songs. Can you give one web URL link and the users will then be able to see all the songs? Pretty sure it can be done, just never did it.
Take care and enjoy Google drive, hope it works out for you.
LB