D.I.Y cassette movement

Cassette culture, or the cassette underground, refers to the practices surrounding amateur production and distribution of recorded music that emerged in the late 1970s via home-made audio cassettes. It is characterized by the adoption of home recording by independent artists, and involvement in ad-hoc self-distribution and promotion networks—primarily conducted through mail (though there were a few retail outlets, such as Rough Trade and Falling A in the UK) and fanzines. The culture was in part an offshoot of the mail art movement of the 1970s and 1980s, and participants engaged in tape trading in addition to traditional sales. The culture is related to the DIY ethic of punk, and encouraged musical eclecticism and diversity.

Several factors led to the rise of cassette culture. The development of the cassette tape recording format was important - the improvement of tape formulations and availability of sophisticated cassette decks in the late 1970s allowed participants to produce high-quality copies of their music inexpensively. Also significant was the fact that bands did not need to go into expensive recording studios any longer. Multi-track recording equipment was becoming affordable, portable and of fairly high quality during the early 1980s. 4-track cassette recorders developed by Tascam and Fostex allowed artists to record and get a reasonable sound at home. As well, electronic instruments, such as drum machines and synthesizers, became more compact and inexpensive. Therefore, it became increasingly feasible to construct home-recording studios, giving rise to an increase of recording artists. Add to this the fact that college radio was coming into its own. For many years there were non-commercial college radio stations but now they had a newfound freedom in format - giving rise to regular cassette-only radio shows that showcased and promoted the work of home recording artists. With the influx of new music from sources other than the major record companies—and the quasi-major medium of college radio to lend support—the audio boom was on.

...
Wikipedia