Thai Classical Music
 
Siamese theater group which performed in Berlin, Germany in 1900.Music sample:
"Kham Hom" ("Sweet Words")
 
Wax cylinder recording of "Kham Hom", or "Sweet Words", performed by the theater group above.

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Thai classical music is synonymous with those stylized court ensembles and repertoires that emerged in its present form within the royal centers of Central Thailand some 800 years ago. These ensembles, while being deeply influenced by Khmer and even older practices and repertoires from India, are today uniquely Thai expressions. While the three primary classical ensembles, the Piphat, Khruang Sai and Mahori differ in significant ways, they all share a basic instrumentation and theoretical approach. Each employ the small ching hand cymbals and the krap wooden sticks to mark the primary beat reference. Several kinds of small drums (klong) are employed in these ensembles to outline the basic rhythmic structure (natab) that is punctuated at the end by the striking of a suspended gong (mong). Seen in its most basic formulation, the classical Thai orchestras are very similar to the Cambodian (Khmer) pin peat and mahori ensembles, and structurally similar to other orchestras found within the wide-spread Southeast Asian gong-chime musical culture, such as the large gamelan of Bali and Java, which most likely have their common roots in the diffusion of Vietnamese Dong-Son bronze drums beginning in the first century ACE.

Traditional Thai classical repertoire is anonymous, handed down through an oral tradition of performance in which the names of composers (if, indeed, pieces were historically created by single authors) are not known. However, since the beginning of the modern Bangkok period, composers' names have been known and, since around the turn of the century, many major composers have recorded their works in notation. Musicians, however, imagine these compositions and notations as generic forms which are realized in full in idiosyncratic variations and improvisations in the context of performance. While the composer Luang Pradit Phairau (1881–1954) used localized forms of cipher (number) notation, other composers such as Montri Tramote (1908–1995) used standard western staff notation. Several members of the Thai royal family have been deeply involved in composition, including King Prajatipok (Rama VII, 1883–1941) and King Bhumibol Adulyadej (1927–), whose compositions have been more often for jazz bands than classical Thai ensembles.

Classical Thai music is heterophonic - the instruments either play the melody or mark the form. There are no harmony instruments. Instrumentalists improvise idiomatically around the central melody. Rhythmically and metrically Thai music is steady in tempo, regular in pulse, divisive, in simple duple meter, without swing, with little syncopation (p.3, 39), and with the emphasis on the final beat of a measure or group of pulses and phrase (p.41), as opposed to the first as in European-influenced music. The Thai scale includes seven tempered notes, instead of a mixture of tones and semitones.