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FWIW, while widely spaced mics can work well, I would avoid it for a vocalist if it is your only pair. You'll get a hole in the center of your image and if your vocalist moves at all, you'll get an image that will bounce from side to side.
I'd take a standard stereo pair (ie X-Y, ORTF, M-S, Blumlein) and place it as Jim mentioned. 6-8 feet out and 6 feet up. As a performance, most singers are quite sensitive to the number of mics in front. If you need more singer than piano, bring the height down and aim straight on. Most singers I work with would drop a log if I tried to put a spot mic in front of them in a solo recital situation.
Back to the pair, though... Personal preference wins out. Depends on the mics you have and use or what kind of sound you want.
Oh, and room mics in a live performance usually get you more audience noise than ambience. Great idea for a session, but not necessarily for a concert.
--Ben
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