Matt Ross-Spang is an American Grammy award winning record producer, engineer, and mixer. His credits include such artists as Jason Isbell, Margo Price, Al Green, John Prine and Elvis Presley.

William Bell is an American soul singer and songwriter. As a performer, he is probably best known for his debut single, 1961's "You Don't Miss Your Water"; 1968's top 10 hit in the UK "Private Number", a duet with Judy Clay; and his only US top 40 hit, 1976's "Tryin' to Love Two", which also hit No. 1 on the R&B chart. Upon the death of Otis Redding, Bell released the well-received memorial song "A Tribute to a King".