Overview

AEG introduces the K1

Source

Wikipedia.org

Full Description

The K1 was first demonstrated at the Berlin radio show in 1935. Fritz Pfleumer was the first to invent magnetic tape as we know it today. What preceeded that were wire tape recorders which were significantly more primitive.
This new type of tape recorder would be used to record speeches by Adolf Hitler where he would appear to be making a speech in one city, while he was actually somewhere else completely.

January R-R Machine https://en.wikipedia.org/wiki/Magnetophon

Overview

BASF makes the first tape recording of a symphony concert.

Full Description

BASF makes the first tape recording of a symphony concert during a visit by the touring London Philharmonic Orchestra. Sir Thomas Beecham conducts Mozart.

R-R Machine