By the 1950s, stereo tape decks, akin to a standard record player, came into regular use in households in the United States. RCA, seeking to improve upon this technology, set about developing a cartridge style format for commercial music sales.¹ In 1958, RCA unveiled their “Sound Tape” cartridge, which bore a resemblance to the common cassette tape. Compared to the reel-to-reel tapes of the day, the RCA cartridge provided a novel convenience for home listening and recording in a more compact package.² RCA advertised their new technology as a “major break-through in recorded sound” and envisioned their stereo tape player as inhabiting homes alongside other prominent technologies of the day, such as the television or the radio.³ However, the RCA cartridge had numerous drawbacks that limited its popularity and functionality. The cartridges could only play 30 minutes of stereo content per side, and lacked the musical variety desired by customers.⁴ Furthermore, RCA could not ensure consistent quality in cartridge production due to limited manufacturing technology.⁵ All of these factors combined caused the RCA cartridge to be a commercial failure, and it was discontinued in 1964.⁶ Despite this, the RCA Sound Tape Cartridge demonstrated the first attempts to streamline magnetic tape technology into a convenient, portable format. While noticeably larger than the cassette tape, it was easier to carry than large reel-to-reel tapes and was much simpler to operate with the proprietary cartridge player. RCA went as far to boast that the player was simple enough for a child to operate.⁷ As the 1950s gave way to the 1960s, the development of magnetic tape as a music format was about to enter the mainstream for good.