20th Century Music

Electronic Music:
Karlheinz stockhausen. Etherophone was the first electronic Insturment. Later on called a Theremin. Hammond Organ, Novachord.

Serialism:
Uses every single note in an octave. (Chromatic Scale). Put notes in any order in that chromatic scale, and only use them once. The line of notes in the particular order is called their serial. Schoenberg is the inventer of serialism. You play the row of notes, then you play it backwards. After you have played it inverted, then put it in retrograde order Retrograde- every interval between two notes in a row would be inverted.