Tuning Forks
Thetazen Shruti Boxes
The shruti box has its roots in the classical music traditions of India, where it evolved as a portable hand-pumped reed instrument designed to hold a steady drone behind vocalists and other musicians. Its name comes from the Sanskrit word shruti, meaning "that which is heard," a term that in Indian musical theory refers to the smallest perceptible interval of pitch and to the foundational tones around which raga melodies are built. Historically, the shruti box replaced the older tanpura in many traveling settings, since it offered the same continuous drone in a far more compact and durable form. Today the instrument is used well beyond its classical origins, finding a place in sound therapy, meditation, kirtan and devotional singing, yoga and chanting practice, songwriting, and any setting where a sustained, breathing drone is needed to anchor voice or melody.
Played by gently rocking the bellows on one side of the box, a shruti box produces its sound by pumping air through internal reeds, with the player choosing which notes to sound by opening or closing small stoppers on the front. Any combination of notes can be held open at once, letting the player build single-note drones, fifths, octaves, or fuller chord-like tonal beds depending on the practice. The bellows breathe slowly and steadily, which gives the shruti box its distinctive living, rising-and-falling quality, closer to a sung note than to a synthesized drone. The instrument requires no tuning, no electricity, and no musical training to use, which is why it has become a favorite among sound practitioners, yoga teachers, kirtan musicians, and singers looking for an unplugged drone they can carry anywhere.
The Thetazen Shruti Box collection offers a range of sizes and note configurations to fit different practices and skill levels. Smaller 13-note third-octave models are well suited to travel, retreats, and chant work, where portability and a grounding lower-mid tone are the priority. Larger 26-note two-octave and 36-note three-octave models open up significantly more tonal flexibility, giving practitioners and professional musicians the range needed for multi-key arrangements, vocal accompaniment across different singers, advanced sound therapy work, and recording or performance settings. Every Thetazen Shruti Box is handcrafted from solid teak with metal corner reinforcements and a polished finish, and each one carries the small natural variations that come with traditional handmade construction. Browse the full collection below to find the size and range that best fits your practice.
