I both sing and play (tho not at the same time, a limitation). If a singer needs to sing it lower, that is more than a whim. Often vocal material is composed at the extremity of the average range to achieve a particular musical effect; when the original pitch was not a=440 this further strains the vocalist. Some singers are merely talented amateurs and have limitations on the instrument that is their voice; but even those with well developed vocal instruments will have preferences that reflect endurance as well as vocal quality.
This singer has asked for a tone below, and has done so well before the performance. Could be worse, could have asked for a third below; could have asked onstage. -- Dana Emery To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html