Schoenberg developed an unusual style of vocal performance, halfway between speaking and singing, called multiple choice klangfarbenmelodie sprechstimme atonality serialism

Sprechstimme

Explanation:

Sprechstimme is an expressionist vocal technique that refers to a technique in which the artist stands between speaking and singing. Some artists refer to this technique as a kind of semi talk near declamation. This technique became popular in the 70s, with hiphop, jazz and faunk artists, is also very common in Jamaican reggae.

answer; beware of exaggerated claims without supporting evidence;