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.
The song was written on the Great Mississippi Flood of 1927. This song is covered by many artists over the years but the best version came out of Heaviest band of all time Led Zeppelin in their best selling unnamed fourth album in 1971. This album also share other legendary songs like Stairway to heaven (Which is arguably the most requested song on Radio).