His first popular song was "Orpheus with his Lute" (1866), and a well-received part song was "Oh! Hush thee, my Babie" (1867). The best known of his songs is "The Lost Chord" (1877, lyrics by Adelaide Anne Procter), written at the bedside of his brother during Fred's last illness. The sheet music for his best-received songs sold in large numbers and was an important part of his income. In this decade, Sullivan's conducting appointments included the Glasgow Choral Union concerts (1875–77) and the Royal Aquarium Theatre, London (1876). In addition to his appointment as Professor of Composition at the Royal Academy of Music, of which he was a Fellow, he was appointed as the first Principal of the National Training School for Music in 1876. He accepted the latter post reluctantly, fearing that discharging the duties thoroughly would leave too little time for composing; in this he was correct. He was not effective in the post, and resigned in 1881. Sullivan's next collaboration with Gilbert, The Sorcerer (1877), ran for 178 performances, a success by the standards of the day, but H.M.S. Pinafore (1878), which followed it, turned Gilbert and Sullivan into an international phenomenon. Sullivan composed the bright and cheerful music of Pinafore while suffering from excruciating pain from a kidney stone. Pinafore ran for 571 performances in London, then the second-longest theatrical run in history, and more than 150 unauthorised productions were quickly mounted in America alone. Among other favourable reviews, The Times noted that the opera was an early attempt at the establishment of a "national musical stage" free from risqué French "improprieties" and without the "aid" of Italian and German musical models. The Times and several of the other papers agreed that although the piece was entertaining, Sullivan was capable of higher art, and frivolous light opera would hold him back. This criticism would follow Sullivan throughout his career. In 1879 Sullivan suggested to a reporter from The New York Times the secret of his success with Gilbert: "His ideas are as suggestive for music as they are quaint and laughable. His numbers ... always give me musical ideas." Pinafore was followed by The Pirates of Penzance in 1879, which opened in New York and then ran in London for 363 performances. Early 1880s In 1880 Sullivan was appointed director of the triennial Leeds Music Festival. He had earlier been commissioned to write a sacred choral