Conversation so far:
What did Billy Taylor do mid-career?
In 1952 Billy Taylor composed one of his most famous tunes.
What Billy Taylor's most famous 1952 tune?
I Wish I Knew How It Would Feel to Be Free is one of Billy Taylor's most famous tunes.
What made Billy Taylor's I Wish I Knew How It Would Feel to Be Free so famous?
I Wish I Knew How It Would Feel to Be Free achieved more popularity with the civil rights movement of the 1950s and 1960s.

Question: What was the song about?
Self-contained rewrite: What was Billy Taylor's song I Wish I Knew How It Would Feel to Be Free about?