Original: On the Sgt. Pepper's Lonely Hearts Club Band album, the song opens to the sound of a chattering audience, and an orchestra tuning up, which was taken from the 10 February orchestra session for "A Day in the Life".
Simplified: On the Sgt. Pepper's Lonely Hearts Club Band album, the song opens to the sound of a loud audience, and an orchestra tuning up, which was taken from the February 10 orchestra session for "A Day in the Life".