All organisms have adaptations that help them survive and thrive. Some adaptations are structural. Structural adaptations are physical features of an organism like the bill on a bird or the fur on a bear. Other adaptations are behavioral. Behavioral adaptations are the things organisms do to survive. For example, bird calls and migration are behavioral adaptations. Adaptations are the result of evolution.
Mahalia Jackson became one of the most influential gospel singers in the world. At most of Dr. King's speeches and rallies she sang Amazing Grace and other uplifting songs. At the March on Washington in 1963, she sang I've Been 'Buked, and I've Been Scorned in front of 250,000 people.
So Gaye's version was released as a single on October 30, 1968. Gaye's I Heard It Through the Grapevine eventually outsold the Pips', and until The Jackson 5's I'll Be There 20 months later, was the biggest hit single of all time on the Motown label. It stayed at the top of the Billboard Pop Singles chart for seven weeks, from December 14, 1968 to January 25, 1969.