Elvis Presley, That’s All Right (1954)
It might come as a shock but “That’s All Right” was recorded when the King was taking a break from recording a different song! He started jamming to Arthur Crudup’s “That’s All Right, Mama” together with his guitarist Scotty Moore and bassist Bill Black. Sam Phillips heard them and pressed record. On side B is “Blue Moon of Kentucky”. If you have one in perfect condition, it is worth around $4,000.
The Thirteenth Floor Elevators — Reverbaration (Doubt) (1966)
Here is an early recording that comes with “You’re Gonna Miss Me”, “Reveraration (Doubt)”, “Fire Engine”, and “Tried to Hide.” The band is very influential in the psychedelic rock genre. However, the success of the band was cut short. Roky Erickson, the guitarist, had paranoid schizophrenia. After he got his treatment, the band reunited in 2015. He passed away on May 31, 2019.