A blues expert is someone who is proficient in the blues.
Blues (English: Blues, meaning "blue", also transliterated as blues) is a kind of vocal and instrumental music based on the pentatonic scale. Another feature of it is its special harmony. Blues originated from the soul music, hymns, labor songs, shouts and hymns of African American slaves in the past.
The "blues sound" used in the blues and the way it is sung show its West African origins. Blues had a great influence on later American and Western pop music. Ragtime, jazz, bluegrass, rhythm and blues, rock music, country music and ordinary pop songs, and even modern classical music all contain blues elements or elements. Developed from the blues.