Following further rehearsal periods (recordings of the resulting demos were later released as "The Chelsea Sessions 1967"), the ISB completed the entire album at Sound Techniques, Chelsea, London in early 1967. The recordings were conducted on four-track, in the first instances of the duo overdubbing, and multi-tracking their wide assortment of instrumentals that included sitar, gimbri, and mandolin. Much of the instrumentals drew upon influences of the psychedelic genre, along with the foreign playing Williamson witnessed in his travels. Williamson and Heron's compositions were eccentric in nature, relating with themes of mythology, life, and religion. For the recordings, session musicians were featured, such as Nazir Jairazbhoy on sitar, Pentangle's Danny Thompson on double bass, and on piano was counter-culture activist John "Hoppy" Hopkins. Future ISB member McKechnie also made her first contributions to the band, appearing as a vocalist and a percussionist.