What new style did Schoenberg create in which vocal melodies were spoken rather then sung with exact pitches and rythems?

Schoenberg created a new style known as "Sprechstimme," which translates to "speech voice." In this technique, vocal melodies are performed in a manner that blends speaking and singing, where the performer follows the notated pitch but does not strictly adhere to exact rhythms or pitches. This innovative approach allows for greater expression and emotional depth, reflecting the complexities of human speech. Sprechstimme became a significant element in his later works, particularly in his "Pierrot Lunaire."