science

Slendro

Slendro is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Slendro rather than just read about it. In short: Slendro (Javanese: ꦱ꧀ꦭꦺꦤ꧀ꦢꦿꦺꦴ) is one of the essential tuning systems used in gamelan instruments that have pentatonic scale. Based on Javanese mythology, the Slendro Gamelan tuning system is older than the pélog tuning system.

Key takeaways

Slendro belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Slendro to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Slendro from memory before moving on to harder problems.

Reference excerpt

Slendro (Javanese: ꦱ꧀ꦭꦺꦤ꧀ꦢꦿꦺꦴ) is one of the essential tuning systems used in gamelan instruments that have pentatonic scale. Based on Javanese mythology, the Slendro Gamelan tuning system is older than the pélog tuning system.

Etymology Slendro is a Javanese term for one of the scales in gamelan. It is derived either from "Sailendra", the name of the ruling family in the eighth and ninth centuries when Borobudur was built, or from the god Sang Hyang Hendra.

History The origin of the slendro scale is unknown. It is thought to be brought to Srivijaya by Mahayana Buddhists from Gandhara of India, via Nalanda and Srivijaya from there to Java and Bali. It is similar to scales used in Indian and Chinese music as well as other areas of Asia and they all may have a common origin. A salendro scale is also found in the neighboring musical ensemble of Kulintang. This is very difficult if not impossible to determine. Even within Indonesia, it is difficult to determine the evolution of scales. For example, scales used in Banyuwangi, at the eastern tip of Java, are very similar to scales used in Jembrana, a short distance away on Bali. There is probably no way to document which region influenced the other, or if they both evolved together.

Tuning From one region of Indonesia to another the slendro scale often varies widely. The amount of variation also varies from region to region. For example, slendro in Central Java varies much less from gamelan to gamelan than it does in Bali, where ensembles from the same village may be tuned very differently. The five pitches of the Javanese version are roughly equally spaced within the octave. As in pelog, although the intervals vary from one gamelan to the next, the intervals between notes in a scale are very close to identical for different instruments within the same gamelan. It is common in Balinese gamelan that instruments are played in pairs which are tuned slightly apart so as to produce interference beating which are ideally at a consistent speed for all pairs of notes in all registers. It is thought that this contributes to the very "busy" and "shimmering" sound of gamelan ensembles. In the religious ceremonies that contain gamelan, these interference beats are meant to give the listener a feeling of a god's presence or a stepping stone to a meditative state. For the instruments that do not need fixed pitches (such as suling and rebab) and the voice, other pitches are sometimes inserted into the scale. The Sundanese musicologist/teacher Raden Machjar Angga Koesoemadinata identified 17 vocal pitches used in slendro. These microtonal adjustments bear some similarity to Indian śruti.

Note names In Java, the notes of the slendro scale can be designated in different ways; one common way is the use of numbers often called by their names in Javanese, especially in a shortened form. An older set uses names derived from parts of the body. Notice that both systems have the same designations for 5 and 6. There is no 4; possibly this is because it appears as an unusual tone in pelog and is not used when modulating between the systems.

The name barang is also sometimes used for 1 in slendro (it is the usual name for 7 in pelog); the octave is then designated as barang alit. In Bali, the scale starts on the note named ding, and then continue going up the scale to dong, deng, dung and dang.

Connotations For experienced participants in gamelan music, the pelog and slendro scales each have a particular feeling, related to the rituals and circumstances in which the scale is used. For example, in Bali, slendro is felt to have a sad sound because it is used as the tuning of gamelan angklung, the traditional ensemble for cremation ceremonies. The connotation also depends on the pathet (roughly, the mode) used. There are three slendro pathet used in Javanese gamelan, nem, sanga, and manyura. That is the order in which they appear in a wayang performance, which historically used only slendro pathet. Consequently, they have the implications of where they appear in the evening.

Illustrations

Worked examples

Example 1 — a first encounter with Slendro

Start with the simplest possible case. Write down what Slendro claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Slendro before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Slendro ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Slendro

In research: Slendro appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Slendro in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Slendro is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anhemitonic scales, Gamelan theory, Musical scales, so understanding it makes those chapters shorter.
In everyday life: Look for Slendro outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Slendro in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Slendro means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Slendro out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Slendro in simple terms?

Why does Slendro matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Slendro?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Slendro.