Raitt’s probably the most known to the mainstream for her string of hit albums, singles and Grammys, and, while Staples has been reintroduced to a wider audience thanks to recent recordings like her acclaimed Jeff Tweedy-produced 2010 album You Are Not Alone on her current label home (the hip Anti Records), her contributions with Staples Singers were crucial. The Blues will be blustering and the Soul will be soulful, perhaps more than at any other concert you’ll see this summer. 7:30 p.m. Saturday Aug. 18. $40.50. Fraze Pavilion, Kettering. fraze.com.