What were the major developments and advancements in recording technologies during the postwar era?

Here are the major developments and advancements in recording technologies during the postwar era:
-The recording tapes were improved made in the material vinyl. The sound became better and fragile.
-Transistor radios were developed. This allowed people to bring smaller sized radios everywhere.
-Development of new microphones
-The introduction of a solid-body guitar by Fender paired with amplifiers.

February 1848 is when it was added. if that's what you were asking