Awesome performance by the very talented Imogen Heap. Taken from the album, Speak for Yourself.

The incredible Imogen Heap – Videosift

Imogen Heap (born December 9, 1977) is a Grammy-nominated English singer-songwriter from Essex, most famous for her work as part of Frou Frou and for her 2005 solo record Speak for Yourself.

Imogen Heap – Wikipedia