In October 1969, when Pink Floyd performed at the Actuel Festival in Amougies, Belgium, they were amidst a pivotal moment in their career. This performance came shortly after the release of their landmark album "Ummagumma," which was issued in November 1969. "Ummagumma" is notable for being a double album, with one disc featuring live recordings and the other comprising experimental studio pieces. The festival performance showcased their evolving sound and stage presence as they began to incorporate more improvisational elements into their live shows. The collaboration with Frank Zappa during this period reflects the adventurous spirit of the late 1960s counterculture, as both artists were pushing musical boundaries. Zappa himself later remarked that this jam session came at a time when he had some free time after the dissolution of his own band, the Mothers of Invention, highlighting a moment of artistic camaraderie and exploration.