Who Are You And What Are You Doing Here? [2007] by Matthew Lee Knowles

Who Are You And What Are You Doing Here?
[choir]

BBC Singers, St Giles Cripplegate [2007]

The singers have parts which consist of their own names with instructions on how to sing the individual letters, for what duration and at what dynamic and rough pitch (high, middle or low)
Singers can move freely about and when they have finished their part, they turn the page over and sign the same thing but with the conductor's name (in this case, it was Richard Baker).
Throughout, the conductor can silence people at will, by pointing at them.