From Series 3, "The Goon Show" (as it was now officially titled) gradually settled into its 'classic' format. Milligan, Stephens and Grafton began to work within a narrative structure and by the second half of Series 4 each episode typically consisted of three acts linked by a continuing plot,:143 with Geldray performing between Acts I and II and Ellington between Acts II and III. Almost all the principal and occasional characters were now performed by Milligan and Sellers, with Secombe usually playing only Neddie Seagoon, who had replaced Pureheart as the hero of most of the stories. The closing theme, backing for Geldray and incidental music was now provided by a big band of freelance musicians under the direction of Wally Stott, who had been writing for the show since the first series.:127 After the end of Series 3, original announcer Andrew Timothy was replaced (at the suggestion of John Snagge) by Wallace Greenslade,:127 who provided spoken narrative links as well as occasionally performing small roles in the scripts.