Read about it here:
Although popularly regarded as the flagship album for the “grunge” sound coming from Seattle, this album was actually an attempted departure from the “grunge” sound for Nirvana, as Kurt Cobain tried to write songs that were more melodic and poppy. Although he followed the typical quiet/loud/quiet formula that defined the Seattle “grunge” sound, he wrote songs that did not rely on the formula so much as they advanced the sound in a new direction. This album dethroned Michael Jackson’s “Dangerous” as the number 1 album of 1992, and launched thousands of bands to success.
Mike B.