Here's some text about the show from the Trafalgar Studio's website:

The Pocket Orchestra
The Unlikely Lives of the Great Composers

A new show by Graeme Garden and Callum McLeod

Starring Sylvester McCoy, The Pocket Orchestra is the complete history of classical music told through the lives of the great composers all in just 90 minutes! Join Mozart, Beethoven, Brahms, Liszt, Haydn, Bach, Schumann and Wagner to name but a few in this fascinating, hilarious and lightning paced journey, featuring virtuoso live performances by a multi talented cast of actor - musicians.

Writer, actor and musician Graeme Garden is best known for his work with Bill Oddie and Tim Brooke Taylor in the award winning TV series The Goodies. He is also synonymous with the classic Radio 4 series I'm Sorry I Haven't A Clue which he devised for the BBC. Countless collaborations include writing and performing with the likes of Rory Bremner, Mel Smith, Griff Rhys Jones, Stephen Fry, Barry Cryer, Arthur Smith and Jeremy Hardy.

Sylvester McCoy is most popularly known as the Doctor in Doctor Who. His stage work includes Noises Off at the Piccadilly Theatre and The Lion, The Witch and The Wardrobe at the RSC.