The prompt provided is a title for a music compilation video featuring the opening and ending theme songs and original soundtracks (OST) from the anime series Jujutsu Kaisen, including works by the band King Gnu and tracks from Jujutsu Kaisen 0.

This genre-bending approach mirrors the clash between the ancient world of curses and modern-day Japan. Hard rock riffs elevate the intensity of life-or-death battles, while eerie, synth-heavy ambient tracks build suspense during investigations. Hip-hop beats are often used to characterize the youthful arrogance and camaraderie of the student sorcerers. By avoiding generic action music, the OST gives every fight scene a distinct rhythm, making the combat feel like a choreographed dance as much as a brutal brawl.

Beyond the commercial theme songs, the background OST (Original Soundtrack) composed by Hiroaki Tsutsumi, Yoshimasa Terui, and桶狭間ありさ (Alisa Okehazama) is where the show finds its true atmospheric depth. Instead of sticking to a traditional orchestral score, the composers utilized a brilliant fusion of genres, including rock, hip-hop, electronic dance music (EDM), and traditional Japanese instruments.

At the forefront of the franchise's musical identity are its iconic theme songs, which act as gateways into its supernatural world. The choices of artists and genres reflect the series' shift in tone across different arcs. The first season opened with Eve’s "Kaikai Kitan," a frantic, pop-rock track that perfectly mirrored the protagonist Yuji Itadori’s sudden thrust into the chaotic world of curses. In stark contrast, the first ending theme, "Lost in Paradise" by ALI featuring AKLO, delivered a groovy, funk-and-hip-hop vibe. This unexpected contrast highlighted the cool, modern aesthetic of the jujutsu sorcerers, proving that a show about death and curses could still possess immense style and swagger.

King Gnu’s contribution to the franchise actually reached its peak with the prequel film, Jujutsu Kaisen 0. The band provided both the theme song "Ichizu" (One Way) and the ending song "Sakayume" (Contradictory Dream). "Ichizu" is a fast-paced, relentless rock track that captures the desperate, consuming love and curse between the main characters, Yuta Okkotsu and Rika Orimoto. Meanwhile, "Sakayume" offers a melancholic, orchestral-rock ballad that processes the grief and bittersweet resolution of the film's climax. King Gnu’s raw energy and sophisticated composition style became synonymous with the cinematic scale of the franchise.