I kinda appreciate what John said... the combination of the four parts seem to be the strongest of importance... and with that--- how you effectively alter the various parts is essentially what makes (or breaks) the artist and the music... Eh?

Vocally... I'd definitely say I have a pitch problem. It's one thing to not have the ability to realize you are hitting a note poorly, but it's frustrating when you hear it plain as day!
Lord help us... the non-singers...LOL

-gary