The fat gives her voice more tone. I'm sure it is completely intentional to be that fat. I saw Heart performing on Paladia or whatever that HD channel is and she was amazing.
In between songs, she would maul a turkey leg real quick to get some extra tone for the next song. It's a small price to pay to be able to wail like that. Perfectly acceptable IMO.
Fatty masages are the best because you get the upper and lower at the same time.
:rofl
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I have recently put on more weight since moving back to the States. :'(