i don't think singing produces any change in the muscles associated with breathing other than coordinating their usage (it usually requires taking a muscle to near failure in a short period of time to produce any type of hypertrophy and, to produce hypertrophy of any kind of notice, those muscles would have to pushed to failure or near failure on a regular basis).
it is probably the feel for the coordination of these muscles that becomes habitual to someone sitting at the piano while singing and, if anything, changing the nature of that feel may make some singers feel uneasy while others might just think 'wow, i'd forgotten how much easier it is to sing when i don't have to play the piano too."
mike
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