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
Theatre of Wales genre. It was made into a film in 1937 and has been frequently revived. "The Corn is Green" (1938) was partly based on his own childhood in Wales. He starred as a Welsh schoolboy in the play's London premiere. The play came to Broadway in 1940 and was turned into a film. His autobiographical light comedy, "The Druid's Rest" was first performed at the St Martin's Theatre, London, in 1944. It saw the stage debut of Richard Burton whom Williams had spotted at an audition in Cardiff. Professional theatre developed in Wales in the 1950s and 1960s. "Under Milk Wood"