I don't think his voice is that low. It's more mid-range. And it's difficult to hear his voice on that track because they multi-layered it with so many vocals. Roger is VERY distinct with his high falsetto and Freddie can get pretty low with his. But Brian I think has more mid-range. Songs like '39 and Good Comapny are good examples of what his voice sounded like during those sessions for "Opera" at the time.