Not a lot of swooning goes on at the Wigmore Hall. Nor does it seem the kind of institution to endorse rapturous wailing, beating of the breast, or the throwing of either flowers or underwear. All of which leaves one with the problem of how to respond appropriately to a concert such as last night’s by Richard Egarr and countertenor Iestyn Davies. Decorous applause doesn’t quite seem to cut it when faced with such a joyous abundance of talent, and I’d have endured any amount of plague and/or restrictive corsetry for an authentic 18th-century atmosphere in which to experience this ecstatic evening of music.