Chinese music, unlike western music, uses a five-tone scale known as the pentatonic scale. The easiest way to see this on a piano is to play the black keys only. The scale will sound oriental. This however, is an oversimplification, as in many Chinese instruments, a Western Diatonic scale is achievable, and 7-note scales are frequently used. Also, the music of ethnic minorities in China is often closely related to that of their neighbors, and microtonal adjustments of pitch are also used. In the Chinese pentatonic, the most commonly used scale is usually D.
Chinese musicology - Wikipedia
A pentatonic scale is a musical scale with five notes per octave , in contrast to the heptatonic scale , which has seven notes per octave such as the major scale and minor scale. Pentatonic scales were developed independently by many ancient civilizations  and are still used in various musical styles to this day. There are two types of pentatonic scales: those with semitones hemitonic and those without anhemitonic. Musicology commonly classifies pentatonic scales as either hemitonic or anhemitonic. Hemitonic scales contain one or more semitones and anhemitonic scales do not contain semitones. For example, in Japanese music the anhemitonic yo scale is contrasted with the hemitonic in scale. Hemitonic pentatonic scales are also called "ditonic scales", because the largest interval in them is the ditone e.
Chinese musicology is the academic study of traditional Chinese music. This discipline has a very long history. Traditional Chinese music can be traced back to around 8, years ago during the Neolithic age. The first musical scales were derived from the harmonic series.
As implied by its name, this scale is suitable for playing Chinese music see also the Oriental Scale. The Chinese scales are sometimes used in jazz improvisation. The Chinese Scale has a quite uncommon feature in the two quadra-steps: first to second note and fourth to fifth note.