Why was the first CD Digital Audio exactly 74 Minutes Long?

When Sony and Philips launched the first Compact Disc (CD ) Digital Audio in 1980, It was precisely 74 minutes long. Sony and Philips approached legendary Herbert Von Karajan to endorse the CD at the Vienna press conference where they would announce the company's prototype. However, Herbert's condition to agree for was the new technology could allow listeners to hear the whole of

Beethoven's Ninth Symphony exactly 74 minutes without interruption.