What "Virtual Choir" producer worked with British composer Guy Sigsworth? 
Guy Sigsworth: Guy Sigsworth is a British composer, producer and songwriter. Guy Sigsworth:  During his career he has worked with many artists, including Seal, Björk, Goldie, Madonna, Britney Spears, Kate Havnevik, Imogen Heap, Bebel Gilberto, Mozez, David Sylvian, Alanis Morissette, Eric Whitacre and Alison Moyet.
i don't know