Question: Jason Eckardt, is an American composer, he began his musical life playing guitar in heavy metal and jazz bands and abruptly moved to composing after discovering the music of Anton Webern, was an Austrian composer and conductor, and was at the core among those within, and more peripheral to the circle of what?
Sentence (from "Anton Webern"): Anton Friedrich Wilhelm (von) Webern (] ; 3 December 188315 September 1945) was an Austrian composer and conductor.
Relevant evidence: Yes