well as singing in opera in Britain and internationally, he was in the Royal Variety Performance at the London Palladium and in pantomime as one of the Ugly Sisters in Cinderella. In 1962, invited to present a one-man show at the Criterion Theatre, London, he preferred to share the bill, and his "after-dinner entertainment" 4 to the Bar had a cast of four. During the run of the show Noël Coward came backstage and said to him, "You have a very good command of your audience. Mind you, anyone who has the hardihood to allow the curtain to rise on them at the Criterion Theatre, sitting in a wing chair with a glass of brandy in one hand and a cigar in the other, has bloody well got to have command of his audience". From the early 1960s to the 1980s, Wallace performed a one-man show, featuring operatic excerpts, ballads and comic songs. He was particularly noted for his performances of the music of Flanders and Swann, and "The Hippopotamus" became his signature tune. Its refrain ("Mud, mud, glorious mud,/Nothing quite like it for cooling the blood") suggested the titles for both of his volumes of memoirs. In his Who's Who profile, under "hobbies", he wrote "singing a song about a hippopotamus to children of all ages." He also sang Flanders and Swann's songs about a rhinoceros, an elephant, a warthog, a gondolier and an income tax collector. His association with them led to his participation in the Hoffnung Music Festivals, in which he performed Variations on a Bedtime Theme, a series of spoof advertisements for a well-known bedtime drink, in the style of Bach, Mozart, Verdi, Stravinsky and Schoenberg, and The Barber of Darmstadt, a send-up of atonal composers. He also contributed to Ledlanet Nights, held at the then house of his first publisher, John Calder, appearing there in his one-man show and in comic roles in musical works. In the theatre, Wallace's roles included Bottom in A Midsummer Night's Dream, of which The Times wrote, "he takes the stage like one inspired, and the result can seldom have been funnier". Other acting roles included César in a West End musical version of Marcel Pagnol's Fanny with Robert Morley, the Emperor of China in Cole Porter's Aladdin, Toad in Toad of Toad Hall, and Ralph in The One O'Clock World in 1984. Broadcasting and film Wallace was one of