MUSIC: ARCHITECTURALLY SOUND UNIT TEST.

CHOOSE THE CORRECT DEFINITION OF TIMBRE.
1. VOLUME LEVEL OF THE MUSIC.
2. SPEED OR PACE OF THE MUSIC.
3. LAYERS OF SOUND AND COMBINATION OF VOICES.
4. UNIQUE SOUND QUALITY OF AN INSTRUMENT'S VOICE.

4. UNIQUE SOUND QUALITY OF AN INSTRUMENT'S VOICE.