Sayonara Ponytail, often stylized as さよならポニーテール or Sayopony, is a mysterious and whimsical Japanese pop band that has created a buzz in the music scene with their unique approach to storytelling through music. Their name is a poignant contradiction, implying both a farewell ('sayonara') and the youthful image of a ponytail, suggesting a complex interplay between nostalgia and innocence. The band allegedly consists of a group of female vocalists and illustrators, although the true member count and their identities have remained a closely guarded secret, adding an aura of mystique to their persona.

Since their inception in the late 2000s, Sayonara Ponytail has consistently released music that blends ethereal vocals with whimsical and emotionally resonant lyrics. Their soundscapes weave together elements of indie pop, dream pop, and electronic influences to create a unique ambiance that has endeared them to a dedicated fan base. Among their recent releases, the tracks "あなたにめり～くりすます" (Anata ni Merry Christmas) and "ルーシア" (Lucia) showcase their penchant for dreamy, narrative-driven compositions, while "ナタリー(パソコン音楽クラブ Remix)" (Natalie [Pasocom Music Club Remix]) underscores their collaborative nature and willingness to explore new sonic territories through remix culture. The song "銀河" (Ginga) or "Galaxy" is reflective of their cosmic and introspective lyrical themes, often gazing into larger existential musings through the guise of pop music. Sayonara Ponytail remains an enigma in the industry, captivating audiences with their artful blend of music and mystery.