The Lao classical orchestra can be divided into two categories,
Sep Nyai and
Sep Noi (or
Mahori). The Sep Nyai is similar to
Piphat, and is ceremonial and formal music and includes: two sets of
gongs (
khong vông), a
xylophone (
ranat), an
oboe (
pei or
salai), two large
kettle drums and two sets of
cymbals (sing, similar to Thai
ching). The Sep Noi, capable of playing popular tunes, includes two bowed
string instruments, the
So U and the
So I, also known to the
Indians. These instruments are similar to the Thai
Saw u and
Saw duang, respectively. They have a long neck or fingerboard and a small sound box; this sound box is made of
bamboo in the So U and from a
coconut in the So I. Both instruments have two
strings, and the
bow is slid between these two strings, which are tuned at a fifth apart and always played together. Furthermore, this
mahori or sep noi ensemble (the sep nyai is strictly percussion and oboe) may include several
khene. In this respect, it differs markedly from the mahori orchestras of
Cambodia and
Siam. Some ethnomusicologists believe the ancient art music of the
Khmer people has been best preserved in
Laos—along with diverse forms of folk music related to the oldest types of Indian music—music that has largely disappeared in India itself. They claim to find in Laos a scale the ancient
Hindus called the "celestial scale," the
Gandhara grama—which is a tempered
heptatonic scale, or a division of the
octave into seven equal parts. The Royal Lao Orchestra, consisting of musicians of the former court of the
king of Laos, who fled Laos following the communist takeover in 1975, now reside in
Knoxville and
Nashville,
Tennessee,
United States. == Folk music ==