The recognised forms of theatre include the musical play, in which the script is significant but the songs dominant (an example is Cabaret) and the play with music, where the governing medium is speech but songs comment on the action as, for instance, in Mother Courage and Her Children.Claire van Kampen’s play Farinelli and the King, though, is not quite either of these, but innovatively combines the experience of watching a star of the classical stage, the actor Mark Rylance, and a major draw from the concert circuit, countertenor Iestyn Davies, perform in the same piece: a sort of two-for-one ticket for Shakespeare’s Globe (where the play originated) and the Wigmore Hall.Rylance is Philip V, the eighteenth-century Spanish monarch who was reputedly lifted from severe dep