"Unhappy Girl" is a compact, driving track from The Doors' 1967 album Strange Days, featuring Robby Krieger's electric guitar solo at 127 BPM in C minor. The song's urgency is heightened by its brevity, with Krieger's solo occupying a focused passage that cuts through the band's dense arrangement. The C minor tonality gives the track a darker edge than much of the album, and Krieger's playing exploits the minor key's tension with bent notes and angular phrasing. Morrison's vocals treat the subject with The Doors' characteristic blend of empathy and detachment, while Manzarek's organ work creates swirling harmonic textures beneath the guitar. The track exemplifies the band's ability to convey complex emotional territory within a concise pop format, refusing to overstay its welcome while delivering genuine musical substance. Krieger's solo, though brief, demonstrates his ability to make every note count within a compressed timeframe. Producer Paul Rothchild captured the band's live energy while adding subtle studio enhancements, maintaining the balance between raw performance and sonic experimentation that defined the Strange Days sessions.