"Kau Tak Setia" is an Indonesian World Music recording. The piece features a prominent flute melody that carries the main theme, supported by a rhythmic percussion section. This percussion includes a consistent bass drum beat that anchors the track and a snare drum that provides a steady, driving pulse. The arrangement also incorporates a string section, which offers a rich harmonic foundation and adds depth to the overall sound. A notable aspect of the composition is the use of a synth pad, which contributes to the ambient texture and broadens the sonic landscape. The interplay between the traditional flute and the modern synth pad creates a distinctive blend of sounds, characteristic of contemporary World Music. The bass drum maintains a foundational rhythm throughout the piece, giving the other instruments a solid base to build upon. The snare drum's consistent presence helps to propel the music forward, ensuring a steady and engaging pace.