Prince of Wales Theatre seating capacity slightly to 1,160 seats and to modernise the theatre's facilities. New bars were added, the auditorium completely rebuilt, the backstage areas refurbished and the theatre's famous tower and exterior completely gutted and refurbished with new LED lighting and a crisp modern finish. The theatre re-opened with ABBA's musical "Mamma Mia!" on 16 April 2004. On 18 August 2007, "Mamma Mia!" became the longest-running show ever at the Prince of Wales, overtaking the previous record held by "Aspects of Love" with 1,326 performances at the venue and counting. The production marked another landmark on Thursday 23 August 2007, celebrating
Sally (musical) comedy debut of Marilyn Miller, a 22-year-old "Ziegfeld Follies" girl. Miller would continue to be a star on Broadway until her death in 1936. The musical enjoyed a successful production in 1921 in London at the Winter Garden Theatre, starring British musical comedy veterans George Grossmith, Jr. and Leslie Henson, which ran for 387 performances. It also played well in 1923 in Australia, produced by the J. C. Williamson company. There were Broadway revivals in 1923 (at the New Amsterdam Theatre) and 1948 and London revivals in 1942 (at Prince's Theatre) and 1952 (Oxford New Theatre). Other productions included a