Reel dancing! Mercury "Living Presence" stereo tape, catalog number MDS5-4. Not an easy one to find; this one's from my collection.
Variable-speed cutting: Marie Hippolyte Rose making a record in 1878. From Sound and Hearing, 1965.
In 1974, they knew how to build receivers!
Nearfield listening at its finest. Courtesy of Wikimedia Commons/Arthur T. Cahill.
We're still trying to figure out how this thing works. From Audio, July 1977.