Bah, cassettes hit the scene in the early 70s and were the 1st tape medium to actually give the longstanding audiophile standard (at that time) reel-to-reel tape decks a run for their $$.
Up to that time the only way to record audio onto tape for the home user had been w/expensive reel to reel equipment. Cassettes pretty quickly brought about the demise of those decks as they were much more affordable for the average Joe and the tapes could actually be used in portable players and car stereos. Kinda hard to get a reel to reel deck in a car
Pulse skimmed right over another tape medium that also came along in that era which was the 4 track deck/tapes. Not hard to imagine though since they came on the scene and disappeared in about as long as it takes for a bong hit to dissipate. 8 track tapes, with twice the length and the same quality of the 4 tracks killed 'em off really quickly
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