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 "Bassist"): Low brass instruments such as the tuba or sousaphone are the standard bass instrument in Dixieland and New Orleans-style jazz bands.
Relevant evidence: No