Sometimes I can get a 'growl' in my voice for a word or two, but I don't know if it's the key I'm singing in, the note I'm hitting, the phrasing, or what that allows me to do it ...

I always marvelled at Elvis's ability to growl a whole song and then sing a ballad as smooth as silk ...

BTW, Mark, I thought your "Mony Pony" (Mony Mony) sounded pretty darn good ...