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Chan Marshall a.k.a Cat Power has been my favorite artist for the past eight or so years, as well as the only person worthy of being an avatar, yes including Jesus. Her voice could make almost any song sound brilliant, and her lyrics are always challenging and powerful (apologies for the vagueness, but Cat Power eludes precise description).
I've recently been listening to older stuff again, especially What Would the Community Think? which I love more and more each time I hear it, and lots of bootleg/rarities stuff.
My favorite Cat Power songs, in rough order:
"Colors & the Kids"
"In This Hole"
"What Would The Community Think" (Live in Paris)
"I Don't Blame You"
"No Sense"
"He Was a Friend of Mine" (Peel Sessions)
"I Found a Reason"
"Taking People"
I'd try to rank the albums, but it's almost impossible to me. Suffice it to say, this is my favorite album of all time:
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Though What Would the Community Think?, The Covers Record, and You Are Free are all up there.
Just an amazing artist, here's waiting for her next album (which she's working on right now).