Generally, electro-acoustic music refers to a wide range of classical electronic music that is played and recorded in the modern era. It involves the interaction of electronic and natural sound effects. This form of music is actually processed through the speaker or microphone, with the original sound being transformed into electrical signals, and the signals are in turn transformed into a different kind of sound. In other words, it is a type of music that is manipulated with the use of computers and electronics. Here are a number of websites that provide more information about electro-acoustic music.