We were listening to him before - I mean, I quoted him before - in "Là ci darem la mano." He composed a Sonata in C Major a piano sonata that could be used to tell a story.
A quién escuchamos antes en la --bueh, "escuchamos"-- citamos antes en "Là ci darem la mano", que compuso una sonata en do mayor, una sonata para piano, que bien puede ser una idea de contar una historia.