The performance RE_SONANCE by artist Antoni Rayzhekov consists of the interaction between different instrumental components. A self-designed electro-acoustic instrument augments a grand piano with the biofeedback information captured by a special wearable device monitoring the heart- rate, tension-level, and the movements of the performer while playing. The amplified sound of the piano resonance is modulated by the physical condition and movement of the performer. The piece revolves around the physical interconnection between performer and instrument, amplifying specific aspects of the sound, based on the emotional and physical response of the body.