To understand the multiple sound possibilities, effects and the feeling that the songs in the harmonica express in Blues, it is necessary to know a little more about this musical style, its origin, its variations and how much it was responsible for the popularization of the instrument. The bends totally changed the approach of the instrument, in fact they recreated it, gave it another meaning, it's like a new instrument. Without detracting from the folk songs that were played when the harmonica was developed in Europe, of course, all music has its value, but the African-Americans, through their own music, and their own vision, revolutionized the harmonica at the beginning of the century. From the moment that the bends were developed, a multitude of possibilities and styles emerged and have been explored and developed until today.