Two hours of Handel operatic duets this evening, and not a moment too long. Patrizia Ciofi and Joyce DiDonato get three Michelin stars for their CD. Sandrine Piau and Sara Mingardo also get three, plus one extra for the greater contrast in their voices (Mingardo is a true contralto, whereas DiDonato is a mere mezzo-soprano). Mr Handel gets three stars for his music, and three extra for the sheer melodic variety. Handel, Mozart and Schubert were the Melody Trio of all music.