'Ballrooms of Mars' (1972) is a hypnotic glam-rock tune from T. Rex’s *The Slider* album. Marc Bolan’s mysterious lyrics mention 'space cats' dancing in cosmic ballrooms, creating a surreal, space-age fantasy. The track features rhythmic flamenco-style guitar and Bolan’s echoing vocals. Though not released as a single, it became a cult favorite for its dreamy, otherworldly feel. 'Ballrooms of Mars' captures T. Rex at their most psychedelic and imaginative – a hidden gem in the glam-rock era.