I have, and suggest that you run close, run cards or even better omnis, and get tape rolling and just let the musician work his or her magic with no time constraints; we did a trial of three different positions for the mics and the grand piano: mics in the case, mics about two feet above the case pointing down at the strings, and mics back about four feet high and about two feet back from the piano itself recording sound from the piano strings and from the reflection off the grand piano cover; we then listened to the results critically, and recorded with the best sounding position; the second postion proved best for us; also, I suggest clearing the room of everyone except pianist and recordist, and keep everyone away and turn all telephones off, nothing like background noise to ruin "the" version of each song played during the recording session; and if he or she screws up a version or does not like a version of a song, tell them to just start over or play it all over again, comfort equals execution I have found