Magnetic tape
Magnetic tape revolutionized sound recording and reproduction and broadcasting. It allowed radio, which had always been broadcast live, to be recorded for later or repeated airing. It allowed gramophone records to be recorded in multiple parts, which were then mixed and edited with tolerable loss in quality. It was a key technology in early computer development, allowing unparalleled amounts of data to be mechanically created, stored for long periods, and rapidly accessed. The Videotape recorder which used magnetic tape allowed TV stations to gather news, timeshift and record content without having to use or develop relatively expensive and single-use film stock while allowing for the tape to be reused.