From Sweet Honey’s webpage:
The “Second Line Blues” song reflects the current state of gun violence, the senseless loss of life, mass murders, and police brutality in our communities. It pays homage to many who are known and unknown including Emmett Till, Freddie Gray, Trayvon Martin, Michael Brown, Clementa Pinckney, Tywanza Sanders, Amadou Diallo, Sandra Bland, Walter Scott, Susie Jackson, Sean Bell, Tamir Rice, Ethel Lance, Cynthia Hurd, Eric Garner, Myra Thompson, Daniel Simmons, and the mass killings in Sandy Hook, Columbine, Virginia Tech and many more. It is written and performed by founding member, Louise Robinson. It is inspired by the New Orleans tradition of funeral procession. The first line of the band is the procession and the second line of the procession consists of the mourners.
And a classic by Sam Cooke, “A Change is Gonna Come”. More about its history here from the New Yorker.