Making a Musical Bow — The Oldest String Instrument

The musical bow is the oldest string instrument on Earth — a hunting bow whose taut string is plucked for music instead of shooting arrows.

Pick a springy branch about a metre long — green hardwood that bends without snapping. A hunting-bow stave is exactly right.

Scrape off the bark and shave down any knots so the wood is smooth and even along its whole length.

Carve a small notch (a nock) right around the wood about 3 cm from one end, so the string cannot slide off.

Carve a matching nock 3 cm from the other end, so both ends can grip the string.

Take a length of twisted sinew (or strong plant-fibre cord) a little longer than the stave. It must not stretch when pulled tight.

Lash one end of the string firmly into the nock at one end of the stave with a tight, non-slip knot.

Bend the stave slightly, pull the string taut, and tie it into the far nock. The tension curves the wood into a bow shape.

Pluck the string with a finger. It should hum a clear note. If it buzzes or sounds dull, tighten it a little.

Pluck steadily near one end. This single low note is the string's fundamental — the slowest way the whole string can vibrate.

Hold one end of the stave lightly against your cheek, close to your open mouth, and pluck the string.

Slowly change the shape of your open mouth. Your mouth cavity picks out different overtones — you can play a tune without touching the string.

Open a free tuner app on a phone and watch the note and frequency change as you tighten or loosen the string.

For a louder bow, cut a round opening in a dried bottle gourd to make a hollow sound-box.

Tie the gourd to the middle of the stave with the opening facing outward, using a short length of cord.

Press the gourd opening against your bare belly and pluck. Lift it on and off to make the note swell and fade — the gourd amplifies the string.

Retie the string tighter for a higher note or looser for a lower one. A shorter, tighter string always sings higher.

A plucked string vibrates as a standing wave, and its pitch depends on three things: tension (tighter = higher), length (shorter = higher) and thickness/mass (thinner = higher). That is why tightening the string or stopping it partway raises the note. The string does not vibrate only as a whole — it also vibrates in halves, thirds and quarters at the same time, producing quiet higher notes called harmonics or overtones. A mouth or a gourd acts as a resonator: its air cavity reinforces whichever overtones match its own size, which is how a mouth bow can play a melody while the string's tension never changes. This single-string idea is the ancestor of every stringed instrument — add more strings on a frame and you have a lyre or harp; stretch them over a hollow box and you have a lute or guitar. Living musical bows are still played today, such as the Brazilian berimbau in capoeira and the uhadi and umrhubhe bows of southern Africa.