Shortly after the Sydmonton Festival, Lloyd Webber began setting the unpublished poems he had been given to music, a few of which were later added into the show. He also composed the overture and "The Jellicle Ball", incorporating analog synthesizers into these orchestrations to try to create a unique electronic soundscape. Meanwhile, Mackintosh recruited Nunn, the then artistic director of the Royal Shakespeare Company (RSC), to direct "Practical Cats". Nunn was an unusual choice as he was considered "too high-brow" for musical theatre, but Mackintosh felt that a "pedigree" director was needed to ensure Valerie Eliot's approval of the project. After much persuasion, Nunn came on board and was joined by his RSC colleagues, choreographer Gillian Lynne and set and costume designer John Napier. Nunn initially envisioned "Practical Cats" as a chamber piece for five actors and two pianos, which he felt would reflect "Eliot's charming, slightly offbeat, mildly satiric view of late-1930s London". However, he relented to Lloyd Webber's more ambitious vision for the musical. Nunn was also convinced that for the musical to have the wide commercial appeal that the producers desired, it could not remain as a series of isolated numbers but instead had to have a narrative through line. He was therefore tasked with piecing the self-contained poems together into a story. Nunn wrote about the significance "Grizabella the Glamour Cat" had on the construction of the narrative: