Alternative

Alternative music (also called alternative rock, alt-rock or merely alternative) is a style of rock music that emerged from the independent music underground of the 1980s and became widely popular in the 1990s. In this instance, the word refers to the genre’s distinction from mainstream rock music. But 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 it. The term is a broad umbrella term consisting of music that differs significantly regarding its sound, social context, and regional roots. By the end of the 1980s, magazines, and zines, college radio airplay, and word of mouth had increased the prominence and highlighted the diversity of it, helping to define some distinct styles (and music scenes) such as noise pop, indie rock, grunge, and shoegaze.
– Wikipedia: The Free Encyclopedia