You will learn how to make the famous “crying harmonica”, a sound effect called the “Wah-wah” and its applications. You will know how to let your sound more expressive, with more feeling, practicing this effect on a classic that marked an era. The “Wah-Wah” is nothing more than the contrast between the open sound and the closed sound, between the bright and muffled sound, made with the opening and closing of the hands. By learning this movement well, you can apply a more sinuous or trembling sound effect.