Castro's most recent studio album, 2003's Gratitude, celebrates his 10 years as a recording artist by paying tribute to the blues, soul, and R&B artists who have shaped his career. Castro covers 12 songs by John Lee Hooker, Chuck Berry, Buddy Guy, Howlin' Wolf, James Brown, Otis Redding & Carla Thomas, Sam & Dave, Albert King, Wilson Pickett, and needless to say, B.B. King ("Bad Case of Love," which, oddly enough, was not included on King's Cook County Jail LP).