Tenshi, Ei-chan, and Shiratori all attend Kawagoe Academy. One day, they get pulled into the orbit of former conductor Haruo. He drags them into his newly founded boys choir where they suddenly find themselves performing a song in front of an audience!

Okay, first, please try matching 
the note from the piano.
حسناً، وافقوا لحن البيانو
في البداية رجاءً
Versucht erst mal,
den Klavierton nachzusingen.
Intenten hacer
la misma nota que el piano.
Intentad alcanzad
la misma nota que el piano.
Essayez tout d’abord
d’imiter le piano.
Allora,
Para começar, cantem
igual ao som do piano.
Для начала попробуйте 
привыкнуть к пианино.