Mesmerising. Andrew Scott is immediately gripping as Langley Collyer, a concert pianist with meticulous and exacting standards for the playing of music. In white tie and tails but with the bow tie undone, he rages about a note and the difference between identical and the same, which has the non musicians in the audience puzzled. His language is refined and esoteric, his personality extreme but fascinating. Our reaction is to be amused.