You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who wrote the song a change is gonna come?" whose answer is Sam Cooke.
Each document should contain about 30 words, and these documents should contain useful information.

Query: who wrote the song a change is gonna come
Useful Output:

Doc 1: comments section. ----- "A Change Is Gonna Come" is a song by American singer-songwriter Sam Cooke. It initially appeared on Cooke's album
Doc 2: Who wrote the song “A Change is Going to Come”? It was written and performed by Sam Cooke, recorded for the album “Ain't That Good News
Doc 3: Sam Cooke never got to bear witness to his song A Change Is Gonna Come becoming the unofficial anthem of the civil rights movement. Or how its
Doc 4: “A Change Is Gonna Come” took root when Cooke heard Bob Dylan's “Blowin' in the Wind” in 1963. He was impacted by Dylan's expression of
Doc 5: Sam Cooke's greatest composition, "A Change Is Gonna Come" resonates just as powerfully today, whether sung by Billy Bragg, Aaron Neville,