Heart Chamber Orchestra

The Heart Chamber Orchestra is essentially a collaboration between PURE, a music collective, and Erich Berger, an interactive artist. 

12 musicians wear a heat rate monitors and are connected to a system which generates both the visuals behind them and the score which they see on laptops placed in front of each one of them.

Naturally, their heart beats change as the performance progresses, thus, the performance becomes more intense.

(via)