There is much good singing to be heard in this production of what may be Handel’s greatest opera, and some that is truly spectacular. Most of the latter comes, fittingly, from the two principals. As Cleopatra, Yvonne Kenny, the admirable Ilia in the 1983 DVD of Mozart’s Idomeneo, gives perhaps the finest performance of her distinguished career, encompassing every aspect of her music from seduction to despair by way of satirical wit without ever (and I mean this literally) losing countenance.