Soundgarden's 1988 debut album Ultramega OK is usually overlooked but was quite a pioneering force in shaping the grunge sound that would explode a few years later. Blending elements of churning metal riffs, a punk ethos, and psychedelia the album showcased Chris Cornell's raw, aggressive vocals and Kim Thayil's innovative guitar work influencing the emerging Seattle music scene.
https://soundgarden.bandcamp.com/album/ultramega-ok-expanded-reissue