This is it, your perfect starting point to understanding how Elvis -- as Howlin' Wolf so aptly put it -- "made his pull from the blues." All the source points are there for the hearing; Arthur Crudup's "That's All Right (Mama)," Roy Brown's "Good Rockin' Tonight," Kokomo Arnold's "Milkcow Blues Boogie," Arthur Gunter's "Baby, Let's Play House," and Junior Parker's "Mystery Train." Modern day listeners coming to these recordings for the first time will want to reclassify this music into a million subgenres, with all the hyphens firmly in place. But what we ultimately have here is a young Elvis Presley, mixing elements of blues, gospel and hillbilly music together and getting ready to unleash its end result -- rock & roll -- on an unsuspecting world.