In 1971, disc-jockey Tom Clay (KGBS/Los Angeles, WCBS-FM/New York, CKLW/Detroit, WSAI/Cincinnati, and many other big stations) had an unusual Top 10 hit, "What The World Needs Now Is Love/Abraham, Martin and John," with backing vocals by The Blackberries; it combined music with on-the-street interviews, about such words as "segregation" and "prejudice," and tapes of Martin Luther King and coverage of the Kennedy assassination.
[I had a chance to meet Tom in 1969 when he was at WCBS-FM and he invited listeners to come to New York City and meet him; I was in high school on Long Island. He died in 1995.]