Blues (also translated as blues, often translated as "resentment music" in Hong Kong and Taiwan) is a kind of vocal and instrumental music based on the pentatonic scale. Another feature of it is its special harmony. . Blues is a singing form that emerged among black folk after the Civil War. It has a direct relationship with black plantation songs (a cappella songs sung by collectives during labor). Blues originated from the hymns, hymns, labor songs, shouts and chants of African American slaves in the past. The "blues sound" used in the blues and the singing style of Qi Ying both show its West African origin.