The therapy monochord belongs to the family of body sound instruments. These are instruments which can be laid on the body or on which you can lie (sound bed) or sit (sound chair). The sound or resonances are not only absorbed by the ears but also transmitted directly from the instrument to the body.
So your own body becomes a resonating space.
One person plays the instrument, and one person experiences the sound, or “is played”.
Although you can put the therapy monochord on your belly and play it for yourself, it is of course much nicer and more intensive if another person plays for you.