Chiaki is asked to leave the S orchestra to play the piano solo of Piano Concerto No. 2 by Sergei Rachmaninoff as requested by Stresseman for the A orchestra. It is revealed that Stresseman was asked by his ex-lover, a member of the academy's board of directors to instruct Chiaki in conducting. The piece performed by Nodame towards the end of the episode is Etude N° 4 in C Sharp Minor by Frédéric Chopin. The short piece that was played by Stresseman's ex is an excerpt from Nocturne Op 55 No. 1 in F minor, also by Frédéric Chopin. (thetvdb.com)