The term Yodeler's Feedback is composed of two words, ECHO and Yodeler. ECHO is a four-letter word which refers to the repetition of sound waves caused by reflection off a surface. Yodeler is a person who sings in a yodeling style, which is a type of singing characterized by rapid changes in pitch between the low-pitched and high-pitched parts of the voice. Therefore, Yodeler's Feedback can be defined as the sound waves that are reflected back to the yodeler from their environment.