Conversation so far:
what is the meaning of song stairway to heaven
Stairway to Heaven is about a woman who accumulates money, only to find out the hard way her life had no meaning and will not get her into heaven.
who sang stairway to heaven“
Stairway to Heaven is a song by the English rock band Led Zeppelin.

Question: when was the song released?
Self-contained rewrite: when was stairway to heaven released?