The singing lesson in act 2 has often been turned into "a show-stopping cabaret". Adelina Patti was known to include Luigi Arditi's "Il bacio", the Bolero from Verdi's "I vespri siciliani", the Shadow Song from Meyerbeer's "Dinorah", and Henry Bishop's "Home! Sweet Home!". Nellie Melba followed suit, accompanying herself on the piano in the final song. Pauline Viardot began the practice of inserting Alexander Alyabyev's "Nightingale". In a recording of a La Scala performance in 1956, Maria Callas sang a shortened version "Contro un cor", transposed up a tone, in E.