There are various interfaces of musical instruments, such as keyboards, strings, percussions. Considering interfaces as a relation of "person and person", we made the electronic musical instruments "Freqtric Drums" so that the persons relate each other."Freqtric Drums" is a electronic musical instrument with MIDI out. We can make sounds of drums (snare,symbal,tom,,etc) by touching other persons. Through production and the demonstration of "Freqtric Drums", we argue the values of the interface of "Freqtric Drums" which enable the players and audience relate or communicate each other.