It was an unrehearsed performance (answer)

Image on left is a BD, Image on right is an SV

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{Clue}
It was an unrehearsed performance
of That's All Right, Mama on July 5, 1954 (70 years ago).

Clue not used!

Well done krenek, Walter_V_R, dagger66 & CuriousJM

SPOILER: Click to show

{Answer}
Image #1
Sun Studios
706 Union Ave
Memphis, TN 38103
35° 8'21.63"N 90° 2'16.05"W
Image #2
Sun Studios Alley
706 Union Ave
Memphis, TN 38103
35° 8'21.10"N 90° 2'15.58"W

I posted this in celebration of the 70th anniversary of:
"That's All Right" (aka "That's All Right, Mama") is best known as the debut single
recorded and released by Elvis Presley. Presley's version was recorded on
July 5, 1954, and released on July 19, 1954, with "Blue Moon of Kentucky" as
the B-side.