I have "Rhythm And Country"Absolutely right Octo !! Red and Sonny are cousins.
By the way, the sound quality of Elvis at Stax is really impressive. The problem with this album release is that these same songs were release at one point or another. Especially in the Elvis Rhythm & country album (essential Elvis volume 5). Nevertheless a true collector like yourself should own it!! Peace out!!
In fact, I got all the RCA Elvis releases from the mid to late 90's.
I made sure I did not miss any of them.