1920s, the early superhet portable radio receiver

1930s, the portable gramophone was invented. it was a revelation and allowed people to take their tunes with them on outings and holidays for the first time.

1940, travelling radio got smaller and came with headphone for a more personal experience.

1950s, transistor radio was invented. Music player become truly portable.

1960s -1970s, 8-track tape, the early cassettes player.

Mid 1970s, portable cassette player became more personal.

1980s, Ghetto blaster, size does matter on the streets. “My radio, believe me, I like it loud I’m the man with a box that can rock the crowd” – LL Cool J