9th of 20, roughly by chronology.
This choice appears because of a single fact: I believe the greatest night in the history of rock and roll music took place on June 27, 1968. That's when Elvis Presley recorded two sets of music on a small stage, with a few of his old music buddies and a very small audience. Parts of these two shows ended up in a televised Xmas special in early December, along with other songs. I could choose the original LP from that show (called, among other things, NBC-TV Special). I could choose a bootleg I treasured for many years, The Burbank Sessions, Vol. 1, which included both small-stage concerts. But eventually, RCA figured out another way to make money, which resulted in a DVD box set, and another CD package called The Complete '68 Comeback Special, which again included all of the material from the two sit-down concerts. So, for the purposes of this list, I'm going with that big package.