For the one-night-only performance at the Royal Albert Hall on May 6, Grey and Crivello will be joined by Ruthie Henshall, star of the first London cast of Chicago, in an evening hosted by Myleene Klass of the pop band Hear’Say. Proceeds will go to the National Autistic Society.

Grey, who headlines the event, created the role of the Emcee in the 1966 stage and 1972 screen versions of Kander and Ebb’s Cabaret. He won both Tony and Academy awards for his performances. He played Amos Hart in the 1996 Broadway revival of Cabaret and more recently appeared as the Wizard in the original New York cast of Stephen Schwartz’s musical Wicked.

Crivello, currently one of two performers rotating in the title role in the Las Vegas production of The Phantom of the Opera, won a 1995 Tony for his performance in Kander and Ebb’s Kiss of the Spider Woman.

Composer Kander and lyricist/book writer Ebb are among the most successfully revived creators of musicals in Broadway history. As well as the current decade-long London revival of Chicago, the 2002 movie version won a Best Picture Oscar.

The line-up for The Night of 1000 Voices, which includes Teri Bibb, Kenneth Nichols and David Michael Johnson, will be accompanied by The City of London Philharmonic and the Sing Live Choir, amassed from around the British Isles.

For more on The Night of 1000 Voices, call (0)207 589 8212. For gala tickets, (0)20 8398 5513.