Soru

The traditional Javanese gamelan, a predominantly percussive ensemble consisting of bronze gongs, metallophones, and drums, is defined by its two distinct tuning systems: the five-note *slendro* and the seven-note *pelog*. To the ears of listeners accustomed to Western classical music, which operates on a standardized system of equal temperament (where instruments are universally tuned to A=440Hz), the intonation of gamelan often sounds idiosyncratic. This is because, historically, there is no standardized tuning across different gamelan sets. Each ensemble is considered a unique entity, possessing a discrete, proprietary tuning; an instrument from one gamelan cannot be swapped into another without creating severe acoustic dissonance.

For decades, the origins and structural logic of these unique tunings have been a subject of intense debate among ethnomusicologists. In the early twentieth century, the pioneering Dutch scholar Jaap Kunst proposed that the *slendro* system was fundamentally intended to be an "equidistant" scale. Kunst theorized that the original creators of the scale utilized a sophisticated, mathematically derived acoustic formula designed to divide the octave into five perfectly equal intervals. He attributed the pervasive variations found in actual gamelan sets to the degradation of the instruments over time or the varying skill levels of regional instrument makers attempting to execute a mathematically perfect ideal.

However, subsequent research utilizing precise spectrographic analysis dismantled Kunst's equidistant hypothesis. Measurements of centuries-old, highly revered gamelan sets revealed that true equidistance in *slendro* is virtually nonexistent. In response, modern scholars like Judith Becker offered an alternative framework grounded in the physical realities of metallurgy and Javanese cultural practices. Becker argued that the variations in tuning were not failed attempts at achieving mathematical perfection, but rather intentional aesthetic choices compounded by the physical constraints of bronze forging. The premium copper-tin alloy (*perunggu*) used in the highest-quality instruments undergoes microscopic structural relaxation over decades, a metallurgical phenomenon that inevitably causes the initial pitches to drift as the metal settles.

Furthermore, the physical process of *panglaras* (fine-tuning) imposes strict directional limitations. Tuning a bronze key (*wilahan*) or a gong involves filing away metal to raise or lower the pitch. Because seamlessly adding metal back to a finished instrument is practically impossible without completely recasting the piece, Javanese tuners historically prioritized harmonizing the internal intervals within a single specific ensemble rather than attempting to align the instruments with an external, theoretical standard. Consequently, the unique intonation of any specific historic gamelan is not a flawed approximation of an idealized acoustic formula, but rather a complex historical record of the bronze's specific metallurgical lifecycle and the distinct acoustic preferences of the patron who originally commissioned the set.

Based on the passage, which of the following best explains why Javanese tuners historically prioritized harmonizing the internal intervals of a single gamelan ensemble rather than attempting to align the instruments with an external standard?