Conversation so far:
who sings in lucy in the sky with diamonds
Lucy in the Sky with Diamonds is a song written by The Beatles' John Lennon and Paul McCartney
What album was Lucy in the Sky with Diamonds on
Lucy in the Sky with Diamonds is a song by the English rock band the Beatles from their album Sgt. Pepper's Lonely Hearts Club Band

Question: When was the album released
Self-contained rewrite: When was the album Sgt. Pepper's Lonely Hearts Club Band released