"Blue notes," also known as "worried notes," are the typically flattened third, fifth, and seventh degrees in a major scale. This is what gives the blues its inherent minor tonality. From performer to performer, or from blues genre to genre, e.g., country blues, the deviation of the "blue note" from the actual scale can be greater.
The blues influenced much of later American and Western popular music. It became one of the roots of jazz, rhythm and blues, and bluegrass. During the 1960s and 1970s, a hybrid form of the blues, blues rock, developed by combining of blues with various rock and roll forms. blues blues rock rhythm and blues blues-rock delta blues classic blues chicago blues electric blues harmonica blues country blues texas blues british blues blues guitar acoustic blues punk blues jazz blues guitar blues piano blues modern blues folk blues desert blues old blues rythm and blues garage blues jump blues rhythm & blues contemporary blues rock blues psychedelic blues blues metal