Listen to Puccini: Madama Butterfly, Act II: Coro a bocca chiusa "Humming Chorus" online. Puccini: Madama Butterfly, Act II: Coro a bocca chiusa "Humming Chorus" is an English language song and is sung by Wiener Staatsopernchor, Wiener Philharmoniker and Herbert Von Karajan. Puccini: Madama Butterfly, Act II: Coro a bocca chiusa "Humming Chorus", from the album 101 Relaxing Classics, was released in the year 2013. The duration of the song is 2:58. Download English songs online from JioSaavn.