Ruthie Cecelia Foster is an American singer-songwriter of blues and folk music. She mixes a wide palette of American song forms, from gospel and blues to jazz, folk and soul. She has often been compared to Bonnie Raitt and Aretha Franklin. Foster has been nominated for multiple Grammy Awards for Best Blues Album and Best Contemporary Blues Album.

Warren Haynes is an American musician, singer and songwriter. He is best known for his work as longtime guitarist with the Allman Brothers Band and as founding member of the jam band Gov't Mule. Early in his career he was a guitarist for David Allan Coe and The Dickey Betts Band. Haynes also is known for his associations with the surviving members of the Grateful Dead, including touring with Phil Lesh and Friends and the Dead. In addition, Haynes founded and manages Evil Teen Records.