how did the former come into existence?
It emerged from the independent music underground of the 1970s.
Alternative rock
Alternative rock (also called alternative music, alt-rock, or simply alternative) is a category of rock music that emerged from the independent music underground of the 1970s
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Alternative rock [SEP] Introduction
Alternative rock (also called alternative music, alt-rock, or simply alternative) is a category of rock music that emerged from the independent music underground of the 1970s and became widely popular in the 1990s. "Alternative" refers to the genre's distinction from mainstream or commercial rock or pop music. The term's original meaning was broader, referring to a generation of musicians unified by their collective debt to either the musical style or simply the independent, DIY ethos of punk rock, which in the late 1970s laid the groundwork for alternative music. In September 1988, "Billboard" introduced "alternative" into their charting system to reflect the rise of the format across radio stations in the United States by stations like KROQ-FM in Los Angeles and WDRE-FM in New York, which were playing music from more underground, independent, and non-commercial rock artists.