Since 1999, Sing-aLong-a Sound of Music has been at London's Prince Charles Cinema.
It's a full-screen version of the Julie Andrews movie, which includes subtitles and encourages audience participation. Elton is such a fan that he once had a special private screening for his birthday.
The show is touring the UK this month and next, and has expanded to other Sing-aLongs, including ABBA and the Rocky Horror Picture Show.
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