In 2015 Sonar introduces for the first time the NFC cashless payment system for everything that was sold inside the festival. Each person that atended the festival had one of this tags. IDSound is a critical engineering project that exploits this system and is using the identification data that is stored on these tags to generate a unique sound id for each atendee of the festival. Together with a “smart” glove this system is used for a participative music performance.