Select all that apply. the "twelve-tone" technique ensures that the 12 notes are given equal importance ensures that the music will be on key is characterized by the works of arnold schoenberg is part of expressionism music

The answers to the question stated above are:
The best statements that describe the "twelve-tone" technique are the following:
-is characterized by the works of Arnold Schoenberg is part of Expressionism music
-ensures that the 12 notes are given equal importance

Note: On this technique, all the 12 notes are thus given more or less equal importance, and the music avoids being in a key.