Mavis Staples sings out: “If Dr. King could see what’s going on right now, he would be very disappointed”

Mavis Staples is a rare ‘60s veteran whose music continues to grow and change in the 21st century. She was an important part of the Staples Singers, a group -- best known for “I’ll Take You There” and “Respect Yourself” -- that blended gospel with soul and blues and ended up providing some of the soundtrack for the Civil Rights movement.Staples went solo in 1969, and over the last few years has seen her albums produced by Ry Cooder, Wilco’