On which happy anniversary did Sgt. Pepper teach the band to play?

"It was twenty years ago today; Sergeant Pepper taught the band to play"

Opening line.

It was twenty years ago today,
Sgt. Pepper taught the band to play,
They've been going in and out of style
But they've guaranteed to raise a smile.
So may I introduce to you
The act you've known for all these years
Sgt. Pepper's Lonely Hearts Club Band.
We're Sgt. Pepper's Lonely Hearts Club Band
We hope you will enjoy the show,
We're Sgt. Pepper's Lonely Hearts Club Band
Sit Back and let the evening go.
Sgt. Pepper's lonely, Sgt. Pepper'lonely,
Sgt. Pepper's Lonely Hearts Club Band
It's wonderful to be here
It's certainly a thrill
You're such a lovely audience
We'd like to take you home with us
we'd like to take you home
I don't really like to stop the show
But I thought that you might like to know
That the singer's going to sing a song
And he wants you all to sing along
So let me introduce to you
The one and only Billy Shears
And Sgt. Pepper's Lonely Hearts Club Band


http://www.lyricsdownload.com/the-beatles-sgt-pepper-s-lonely-hearts-club-band-lyrics.html


http://www.lyricsdownload.com/the-beatles-sgt-pepper-s-lonely-hearts-club-band-lyrics.html

The album was released on June 1, 1967 in the United Kingdom and on June 2, 1967 in the United States.

So, June 1, 1947 in the UK and June 2, 1947 in the US.

Damn Math-Heads! :)