The "elite student in music room 2" turns out to be Haruki's delinquent classmate, Kazusa Touma.  With his characteristic pushiness, he tries to get her to join the light music club.  But his pushiness backfires, and only makes her more annoyed.  Setsuna gets irritated... no, involved, and approaches Kazusa secretly.
Play the piano, of course!
Natürlich das Klavier zu spielen.
¡Tocar el piano, claro!
Pues tocar el piano, claro.
Que tu joues du piano, bien sûr !
Tocar piano, é claro!