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Rock sónico is an Argentine alternative rock current from the early-to-mid 1990s that fused shoegaze textures, noise rock abrasion, and dream pop ambience with the melodic sensibility of local rock nacional. It is defined by thick, effects-laden guitar layers, hazy or ethereal vocals, hypnotic mid‑tempo grooves, and a pop-art sensibility that embraced irony, sensuality, and futurist imagery. While indebted to UK/US indie and shoegaze, rock sónico localized those influences through Spanish-language lyrics, danceable rhythms, and production aesthetics that favored saturated timbres and immersive atmospheres.

Grunge is a guitar-driven subgenre of alternative rock that emerged in the mid-to-late 1980s in Seattle, United States. It fuses the raw aggression and DIY ethos of punk with the weight and riff-centric power of hard rock and heavy metal. Characterized by thick, heavily distorted guitars, dynamic quiet–loud song structures, and a visceral, unpolished production aesthetic, grunge foregrounds themes of alienation, apathy, social disaffection, and personal struggle. Vocals often shift between subdued, introspective verses and cathartic, shouted or soaring choruses, while lyrics tend toward confessional and existential tones. Beyond sound, grunge represented a cultural stance: anti-gloss, anti-virtuosity, and anti-commercial posturing—even as it became a global commercial force in the early 1990s.