Anime Music: From Opening Themes to City Pop to the Songs That Define Generations
By Yoshi | Japan Unveiled
Cruel Angel’s Thesis.
If you have watched anime for any meaningful period, you know this piece of music. You may not know its title. But if you hear the first four notes of the bass line, something in your nervous system responds before your conscious mind catches up — a response that is partly aesthetic and partly something else, something closer to the specific emotional resonance of a thing encountered at the right moment in the right state of openness.
Zankoku na Tenshi no Tēze — “Cruel Angel’s Thesis” — is the opening theme of Neon Genesis Evangelion, composed by Hidetoshi Satō and performed by Yoko Takahashi. It aired for the first time in October 1995. It is, by any reasonable measure, one of the most culturally significant pieces of music in the history of Japanese popular culture.
I want to tell you about anime music — not as a footnote to the story of anime itself, but as a subject of genuine cultural significance in its own right.
The Function of the Opening Theme: Three Minutes of Orientation
The opening theme (OP) of an anime series has a specific and important function that extends beyond providing thirty to ninety seconds of music before the episode begins.
The opening theme establishes the emotional key of the series — the specific combination of energy, mood, and aesthetic character that the series will inhabit. A well-chosen opening theme tells you, before the first episode’s narrative has begun, what kind of experience the series is offering. It creates the specific anticipation that the viewer brings to each episode and conditions the emotional state that they are in when the story begins.
The best opening themes become inseparable from the series they serve. Cruel Angel’s Thesis cannot be heard without Evangelion. Tank! (the Cowboy Bebop jazz-fusion theme by Yoko Kanno) cannot be heard without the specific atmosphere of the show’s aesthetic world. Guren no Yumiya (Attack on Titan‘s first OP) cannot be heard without the specific urgency and scale of its source material.
This inseparability is the specific achievement of the best anime music: it becomes the emotional anchor for the entire viewing experience, such that hearing it years later re-activates the complete emotional experience of the series.
The Composers: Who Makes Anime Music
The anime music ecosystem involves several distinct professional roles whose work combines to produce the complete sonic experience of an anime series.
The composer (sakkyoku-ka) writes the original score — the incidental music, the action themes, the emotional cues, the specific musical vocabulary that the series uses to guide the viewer’s emotional response across each episode. The relationship between the visual storytelling and the musical storytelling is among the most complex in animated production.
Yoko Kanno — whose work includes the complete scores for Cowboy Bebop, Ghost in the Shell: Stand Alone Complex, Macross Frontier, and Carole & Tuesday — is the most internationally celebrated Japanese anime composer and one of the most versatile: her compositional style ranges across jazz, electronic music, classical, folk, and various other styles depending on the specific series’ requirements.
Hiroyuki Sawano — whose specific compositional approach (the specific combination of orchestral grandeur, electronic elements, and choral performance that has become recognisable as a distinct style) has been applied to Attack on Titan, Kill la Kill, Mobile Suit Gundam Unicorn, and various other series — is the dominant voice in the contemporary action anime score category.
The OP/ED artists — the specific performers and bands whose songs are used for opening and ending themes — occupy a specific position in Japanese popular music. Performing an anime OP or ED is commercially significant (it exposes the artist to the show’s audience and generates streaming and download revenue) and culturally significant (the anime audience is among the most engaged music audiences in Japanese popular culture).
The Artists: How Anime Created Careers
The relationship between anime and Japanese popular music is bidirectional — anime has created audiences for specific artists, and specific artists have shaped what anime sounds like.
LiSA — the singer whose recording career developed in parallel with her association with the Sword Art Online franchise (she performed the SAO II ending theme and various other SAO-related songs) and whose Gurenge (the Demon Slayer first season OP) became the most streamed Japanese song in the world in 2020 — is the most visible contemporary example of an artist whose career was substantially built through anime association.
YOASOBI — the unit consisting of composer Ayase and vocalist Ikura (Lilas Ikuta) whose Yoru ni Kakeru became one of the most streamed Japanese songs internationally and whose subsequent work includes the Oshi no Ko OP Idol — represents the most commercially significant recent example of the intersection between anime music and mainstream Japanese pop.
Kenshi Yonezu — whose Lemon was the most streamed Japanese song in the world for multiple years and whose Pale Blue (Evangelion related) and Spinning World (anime related) placed him at the centre of the anime music conversation — is the individual artist whose work most clearly demonstrates the specific power of anime association for Japanese pop music careers.
The City Pop Anime Connection
I have written separately about the city pop revival and about the specific global rediscovery of Japanese music of the 1980s. The connection between city pop and anime is worth making explicit here.
Mariya Takeuchi‘s global viral moment — the international discovery of Plastic Love through YouTube — was enabled partly by the visual aesthetic of the videos that accompanied the audio: vintage anime imagery, the specific visual vocabulary of 1980s Japanese animation that has become aesthetically desirable to contemporary international audiences.
The specific combination of city pop’s audio aesthetic and vintage anime’s visual aesthetic has been commercially significant — producing the lo-fi aesthetic that characterises much of the YouTube music and study-with-me content that introduced many international audiences to the city pop sound.
This aesthetic confluence — city pop as the soundtrack to vintage anime as the visual language of a specific nostalgic Internet culture — is one of the more interesting cases of unexpected cross-cultural synthesis in contemporary media.
— Yoshi 🎵 Central Japan, 2026
