In April 1969, Pink Floyd was in a transformative phase of their career, having just released their second studio album, "A Saucerful of Secrets," in June 1968. This period marked a significant evolution in their sound, moving away from the psychedelic influences of their early work and beginning to explore more intricate musical compositions. The live rehearsal footage for “Green Is The Colour,” captured at the Royal Festival Hall, showcases the band’s early experimentation with atmospheric soundscapes and emotive lyrical content that would come to define their later albums. Interestingly, during this time, Pink Floyd was also beginning to refine their stage presence and visual elements, which would ultimately contribute to their status as pioneers in live performance. This rehearsal highlights their commitment to integrating music with visual artistry, foreshadowing the elaborate shows that would accompany later releases like "The Dark Side of the Moon."