The music used for Khmer classical dance is played by a pinpeat ensemble. This type of orchestra consists of several types of xylophones, drums, oboes, gongs, and other musical instruments. The chorus consists of several singers and mainly sing in the absence of music. The lyrics are in poetry form and are sung interspersed with the grammatical particles eu [əː], eung [əːŋ], and euy [əːj] in various patterns.