ECHO, in Music, is a term applied to that sort of airs or pieces in which certain passages are repeated with diminished intensity of sound. Paisiello, in his Proserpina, and Mayer, in his Elisa, employed this kind of echo. Skilful performers on the horn, the flute, the clarinet, &c., produce echo passages with great effect. A certain organ stop is also called an echo; and on the same instrument an echo is imitated by means of alternate loud and soft stops,—the latter repeating phrases given out by the former. (O. F. O.)