Bansuri: the bamboo flute explained

What a bansuri is and how it is made

The bansuri is the side-blown bamboo flute of North Indian music. Side-blown means the player blows across a hole near one end, rather than into the end of the tube. Its name comes from bans, the Hindi word for bamboo.

The body is a single length of hollow, seasoned bamboo. One end is closed, and the blowing hole sits nearby. Along the body are six or seven finger holes. These are separate from the blowing hole, so the hole count describes the places where the fingers work.

There are no mechanical keys between the fingers and the holes. The player covers the holes directly, while the lips and breath work at the blowing hole. A single bamboo tube provides the body, but the player's fingers, lips and breath do the work of making music.

How fingers and breath change the pitch

Covering and uncovering those finger holes changes the pitch, meaning how high or low a note sounds. The bansuri has no keys or mechanism to do this work. The player's fingers cover the holes directly, while the lips and breath help shape the sound.

But finger position is only part of the story. Breath speed also changes pitch. A player can keep the same holes covered and blow harder to move into the octave above. An octave is the span from a note to its next higher counterpart.

By combining changes in fingering with changes in breath speed, a skilled player can cover about three octaves. That means three spans between a note and its higher counterpart. The range comes from fingers and breath working together, rather than from extra keys.

How players lower notes and slide between them

A finger does not have to cover a hole completely or leave it fully open. By partly covering it, the player can reach notes between those made with fully covered or uncovered holes. This is how the bansuri produces komal, meaning lowered, notes without keys.

The movement matters too. When a player slowly rolls a finger off a hole, the pitch can slide rather than jump. This is meend, a slide between notes. Listen for the journey from one note to the next, not just where it lands.

These slides help explain why the bansuri is often compared to the voice. Instead of keeping every note separate, the player can connect them through a continuous change in pitch. Breath shapes the sound while the fingers guide that movement between notes.

Bansuri sizes and keys

The size of the bamboo flute changes both its sound and how it sits in the hands. A short bansuri sounds higher and brighter, and is common in folk and film music. Its finger holes sit closer together than those of a long flute.

A long bansuri gives a lower, warmer sound and is the standard concert instrument. Some are over two feet long. The holes are farther apart, so players stretch their hands and use the sides of their fingers to cover them.

Each bansuri is built around one home note, called Sa. Flutes in different keys have different home pitches. A player therefore carries a set of bansuris, choosing one to match the singer or the raga rather than using the same flute for every performance.

Who brought the bansuri to the concert stage

The long concert flute is one part of the bansuri’s story. For most of its history, this bamboo flute belonged to folk and devotional music. It also appears as Krishna’s flute in stories and paintings, an association beyond the concert stage.

Pannalal Ghosh, who lived from 1911 to 1960, developed the long, low bansuri and brought it into Hindustani classical music, the North Indian classical tradition. His work helped establish it as a concert instrument in the 20th century. The larger flute became the standard for concert performance.

Hariprasad Chaurasia, born in 1938, carried the bansuri to listeners worldwide. His approach drew on both vocal and instrumental techniques, and he trained many of today’s players. Ghosh helped establish its concert place; Chaurasia helped bring that sound to wider audiences.

How the bansuri compares with other flutes

The venu is the bamboo flute of Carnatic music. It is usually shorter than the bansuri and has eight finger holes, rather than six or seven. Players use these holes for the ornaments, or ways of decorating notes, of the Carnatic style.

On the bansuri, fingers cover the holes directly. There are no keys or moving mechanisms between the hand and the bamboo. Half-covering a hole lowers a note, while slowly rolling a finger away lets the pitch slide rather than jump.

The Western concert flute is metal and uses keys. It can play Indian melodies too, so the difference is not simply which music each instrument can play. The bansuri’s open holes make slides and small shades of pitch more natural to produce.

What to listen for in a bansuri performance

Begin with the alap, the slow opening of a raga. A raga is a melodic framework for creating pieces and inventing melody during performance. Listen to how breath shapes each note before the player moves on.

Follow a held note into a meend, a slide between notes. Notice how the player lets one note become the next rather than separating them. These slides help explain why the flute is often compared to the voice.

When the passages become faster, shift your attention to the rhythm of the fingers. Listen also for tonguing, the use of the tongue to start or separate notes. Together, these give the flute its bounce.

Throughout the performance, listen for Sa, the home note, against the drone, a steady reference sound. Notice each return to Sa. Keep an ear on where the player breathes and how those breaths shape the phrases.

How to start learning the bansuri

If listening makes you want to try, start with a mid-sized bansuri, the side-blown bamboo flute of North Indian music. Choose a comfortable key, or home note. Long concert flutes have widely spaced holes, so they ask more of your hands.

Begin by making a steady tone before adding finger movements. Work first on the open note, with the finger holes uncovered. At this stage, the task is to keep the sound steady rather than move through a melody.

Then practise the seven basic notes slowly: Sa, Re, Ga, Ma, Pa, Dha and Ni. Play over a drone, a steady reference sound, with Sa as your home note. Keep the pace slow enough to give each note your attention.

Find a teacher to help with embouchure, the position of your lips when you blow, and half-holing, partly covering a finger hole. These are hard to learn from a diagram. Half-holing lets you reach komal, or lowered, notes, so it matters beyond getting the basic scale under your fingers.