Eminent Irish tenor Michael Kelly, for whom Mozart created the roles of Don Basilio and Don Curzio in his da Ponte opera "Le nozze di Figaro", was of the opinion that although they played well their performance as a whole was not outstanding; but the image of four of the greatest composers of their time joining in common music-making remains an unforgettable vignette of the Classical era (comprising the second half of the eighteenth century).