In terms of physical media:

For 1/8" cassette tape, KCS appeared in 1975 but the tape itself was in use 20+ years prior: https://en.wikipedia.org/wiki/Kansas_City_standard

½" consumer tape of Betamax and VHS didn't arrive until the same year.

¼" QIC DC300 appeared ~1972 but was largely inaccessible to hobbyists and home users until around 1995/1996 with QIC-40 and Travan.

There were also home 1/4" reel-to-reel home audio systems from roughly mid '50's onward.