Sweeney Todd that had four performances from 5–7 July at London's Royal Festival Hall. This idea came from Terfel and his fellow bass-baritone and friend, the Irishman Dermot Malone. Terfel has not shied away from popular music either. He has recorded CDs of songs by Lerner and Loewe and Rodgers and Hammerstein. In 2001 he commissioned and performed 'Atgof o'r Sêr' ('Memory of the Stars') in the National Eisteddfod with the composer Robat Arwyn. In September 2007 Terfel withdrew, to severe criticism, from Covent Garden's Der Ring des Nibelungen when his six-year-old son required several operations on his finger. But he did successfully return to the Met in November 2007 to sing the role of Figaro. He told reporters in New York City that he would retire Figaro from his repertoire. But he did sing the role of Wotan in Covent Garden's revival of the Der Ring in September to November 2012. Terfel intended to take 2008 as a sabbatical from opera performances, but broke this to take the title role in WNO's revival of Falstaff. He had sung in this production in 1993, when he played the role of Ford. In 2009 Terfel sang Scarpia and the Dutchman for the Royal Opera House. Since 2010 In 2010, Terfel made his debut as Hans Sachs in Wagner's Die Meistersinger in a production for Welsh National Opera, in Cardiff and on tour. On 17 July 2010, the cast of this production gave a "concert staging" at the Royal Albert Hall as part of the 2010 BBC Proms, which was broadcast on BBC Radio 3 and on BBC Four television. On 31 July, again at the Proms, he performed in a concert from the Royal Albert Hall celebrating the works of Stephen Sondheim, in his 80th birthday year. Terfel took on the role of Wotan for the premiere performances of Robert Lepage's new Met staging of Wagner's Der Ring 2010–12. He sang the role in all three of the four Der Ring operas that feature Wotan: Das Rheingold, Die Walküre and Siegfried. In September 2013 Terfel collaborated with Mormon Tabernacle Choir released the album Homeward Bound which reached No. 58 Official UK Charts. In September 2014 Terfel reprised his role as Sweeney Todd in the Live from Lincoln Center concert production of Sweeney Todd, which was broadcast on PBS. This production also starred Emma Thompson as Mrs Lovett and Audra McDonald as