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Ah am so steel een luv weeth yoo
This could have been part of the problem with the quality of her vocal performance during these sessions...combined with the aging and malnutrition deleterious effects. Acting together they probably created a really difficult challenge for even her phenomenal singing abilities...she was no longer down deep in her basement mining gold...
The "in the basement" thing is a Richard construct. Phil and she likely didn't want to do that. Even so, she's hitting an E#3 repeatedly in "If We Try" - not totally her lowest (I think D#3 on "Only Yesterday" is her lowest just going off memory) but that's pretty good for a female vocalist. She didn't stay there and really, why should she have? She did a ton of that with Richard. This wasn't a Richard project; this was Karen. This was her chance to do different things and I think going higher was one of the differences. She still could do it; she just chose not to. Still won't go with you on the "deteriorating voice" hypothesis - no matter how often you post it.
Ed