He also had engineer Nick Griffiths record children singing the verse at Islington Green School, close to Pink Floyd's studio. Griffiths was instructed to record only two or three children; inspired by a Todd Rundgren album featuring an audience in each stereo channel, he suggested recording an entire school choir. The school allotted only 40 minutes for the recording. Alun Renshaw, head of music at the school, was enthusiastic, and said later: "I wanted to make music relevant to the kids – not just sitting around listening to Tchaikovsky. I thought the lyrics were great – 'We don't need no education, we don't need no thought control' ... I just thought it would be a wonderful experience for the kids." Renshaw hid the lyrics from the headteacher, Margaret Maden, fearing she might stop the recording. Maden said: "I was only told about it after the event, which didn't please me. But on balance it was part of a very rich musical education." Renshaw and the children spent a week practising before he took them to a recording studio near the school. According to Ezrin, when he played the children's vocals to Waters, "there was a total softening of his face, and you just knew that he knew it was going to be an important record." Waters said: "It was great—exactly the thing I expected from a collaborator." For the single version, a four-bar instrumental intro was added to the song that was created by looping a section of the backing track. The single fades out during the guitar solo. The version included on the compilation A Collection of Great Dance Songs combines the single version's intro and the LP version's ending. (Later compilations such as Echoes: The Best of Pink Floyd and The Best of Pink Floyd: A Foot in the Door instead include the album version prefaced by "The Happiest Days of Our Lives".) In exchange for performing vocals, the children of Islington School received tickets to a Pink Floyd concert, an album, and a single. Though the school received a payment of £1,000, there was no contractual arrangement for royalties for the children. Following a change to UK copyright law in 1996, they became eligible for royalties from broadcasts. After royalties agent Peter Rowan traced the choir members through the website Friends Reunited and other means, they successfully lodged a claim for royalties with the Performing Artists' Media