Janggu Rhythms (Jangdan): Learn Them by Saying Them

What is a jangdan?

Jangdan (장단, literally “long-short”) is a fixed pattern of strong and weak strokes that repeats as a cycle. When one cycle ends, the next begins on the same downbeat. It looks like a bar of Western music, but a jangdan carries more: an inner arc of pushing, holding, tying and releasing tension.

Folk song (minyo), pansori storytelling, sanjo solos and farmers’ band music (pungmul) all ride on jangdan, and the instrument that keeps the cycle is the janggu. Learning a jangdan means learning how the janggu moves through time.

The two heads of the janggu and its syllables

The janggu is an hourglass-shaped drum with two heads. The left head (gungpyeon) is struck with a mallet or the palm for a low, round sound; the right head (chaepyeon) is struck with a thin bamboo stick for a high, crisp crack. Musicians say these sounds aloud with syllables called gueum (구음, “mouth sound”) — a tradition close to Japanese kuchi shōga or Indian konnakol.

Sources and regions spell the same stroke differently (kung/gung, deok/tta). The diagrams below keep the spelling used by the dictionary or teaching material that describes each rhythm.

Three per beat: sub-beats and compound time

Most jangdan split each beat into three small beats (sobak). In Western terms that is close to 12/8 (four beats of three) or 9/8 (three beats of three). That is where the gentle sway — “one-two-three, one-two-three” — comes from.

Write the same rhythm on a straight sixteenth-note grid (four per beat) and every stroke lands slightly off, so it sounds stiff and mechanical. The janggu mode in Two Beat was first built that way; we rebuilt it on a three-per-beat grid to keep the feel.

In the diagrams, each small box is one sub-beat and each outlined group is one beat. Orange is the left hand, blue the right hand, half-and-half both hands (deong), and a yellow underline marks an accent. Press Listen and the box you are hearing lights up.

Semachi — the rhythm of Arirang

Semachi has three beats of three (9/8). Say it as “deong —, deong tta, gung tta”. The right hand nudges at the end of the second beat and the “gung tta” of the third beat hands over to the next “deong”, so the cycle rocks like a swing.

Korea’s best-known folk songs — the standard Arirang, Miryang Arirang and Doraji Taryeong — are sung over semachi. Sources give a tempo of roughly 80–110 dotted-quarter beats per minute.

Jajinmori — “deong, kung, kung-deok kung”

Jajinmori is a fast cycle of four beats of three (12/8). The form taught in Korean schools is simply “deong, kung, kung-deok kung”. The stick stroke on the last sub-beat of the third beat tugs the fourth beat forward — that is the off-beat flavour of the cycle. At the end of a phrase this spot is often played big and hard.

Tempos run roughly 90–144 dotted-quarter beats per minute, commonly 100–110. In farmers’ band music the same family is called samchae or, onomatopoeically, deongdeokgungi — the origin of the name of Two Beat’s janggu mode.

Jungjungmori — plain strokes that tie the cycle

Jungjungmori also has four beats of three, but it is played with single strokes only — no gideok, no rolls. Its power comes from the hard “tta” on the ninth sub-beat, the end of the third beat. Its twelve sub-beats are often described in groups of three that push, hold, tie and release.

Tempos sit around 80–90 dotted-quarter beats per minute (down to 50 when slow). It is the middle gear of songs that start slow and speed up, such as Ganggangsullae and Kwaejina Chingching Nane.

Gutgeori — “deong gideok kung deoreoreo”

Gutgeori is a dance rhythm of four beats of three. Say it as “deong gideok kung deoreoreo, kung gideok kung deoreoreo”. Accents fall on the first sub-beat and on the ninth (the gideok in beat three), while the little rolls throw your weight into the next beat.

Cheerful folk songs like Nilliriya and Pungnyeonga use gutgeori, at roughly 66–90 dotted-quarter beats per minute. A good way in is to play each gideok and each roll as a single “deok” first — exactly how Two Beat’s easy stage simplifies it.

Hwimori — the whirlwind finale

Hwimori is the fastest, driving cycle and, unusually, divides each beat in two. The weight on the back half of the third beat keeps it racing forward. In samulnori it whips up the end of a performance while the janggu chops “gung-ttak gung-da” in steady eighths. Published tempos vary widely.

Where the off-beat lives: tying and releasing

Put gutgeori, jajinmori and jungjungmori side by side and one thing stands out: all three hit the last sub-beat of the third beat (the ninth box) hard, pulling into the fourth beat. The weight lands off the beat, so tension builds — and it releases on the fourth beat and the next “deong”.

Korean musicians call this tying and releasing (맺고 푼다). A slow jinyang cycle is divided into four parts — push, hold, tie, release — and jungjungmori’s twelve sub-beats follow the same arc in groups of three. That is why a jangdan never feels like a loop, even though it repeats.

Pansori singers deliberately play against the cycle: eotbuchim straddles the end of one cycle and the head of the next, ingeogeori moves the accent onto a sub-beat, and gyodaejuk switches between groupings of two and three.

Practice tip: first, land only the opening “deong” of each cycle. Once your body knows the cycle, aim for the “deok” on the ninth sub-beat. When that single stroke clicks, the whole rhythm comes alive.

Jangdan and folk songs

Many songs start slow and accelerate. As Ganggangsullae speeds up, the chorus answer shrinks from “ganggang-sullae” to just “sullae” — faster cycles, shorter exchanges. The same idea drives the gong duel of samulnori (Kkwaenggwari off-beats and jjaksoe).

Practise with Two Beat’s janggu mode

Two Beat’s janggu mode lets you play these cycles with two buttons: the left button (F or the left half of the screen) is the low “kung”, the right button (J or the right half) is the high “deok”, and both together make “deong”.

• The teacher plays the first cycle — listen and watch before anything is scored.
• A gueum line lights up the syllables of the cycle you are playing.
• A guide drum fades while you are on time and comes back when you slip.
• Gong, drum and jing — the big gong rings each cycle, and when your excitement gauge fills, the kkwaenggwari switches to off-beat riffs.
• Stages — easy: jajinmori → jungjungmori → semachi (with Arirang) → gutgeori → hwimori. Hard adds the gideok grace notes and rolls.