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
Musical theatre way for Kern's later work by showing that a musical could combine light, popular entertainment with continuity between its story and songs. Historian Gerald Bordman wrote: The theatre-going public needed escapist entertainment during the dark times of World War I, and they flocked to the theatre. The 1919 hit musical "Irene" ran for 670 performances, a Broadway record that held until 1938. The British theatre public supported far longer runs like that of "The Maid of the Mountains" (1,352 performances) and especially "Chu Chin Chow". Its run of 2,238 performances was more than twice as long as any previous musical,