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?

Context articles: List of compositions by Anton Webern
Passacaglia for orchestra (Webern)
Jason Eckardt
Bassist
Jacques-Louis Monod
Music of Baltimore
Andy Moor (The Ex)
Karl Weigl
Michael Chapman (singer)
Anton Webern

This is a list of compositions by Anton Webern, the Austrian composer and conductor.
The Passacaglia for orchestra, Opus 1, is the first published composition of twentieth century Austrian composer Anton Webern.
 It is based on the 17th century musical form, the passacaglia.
Jason Eckardt (born 17 May 1971 in Princeton, New Jersey) 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.
A bassist, or bass player, is a musician who plays a bass instrument such as a double bass, bass guitar, keyboard bass or a low brass instrument such as a tuba or sousaphone.
 Different musical genres tend to be associated with one or more of these instruments.
 Since the 1960s, the electric bass has been the standard bass instrument for funk, R&B, soul music, rock and roll, reggae, jazz fusion, heavy metal, country and pop music.
 The double bass is the standard bass instrument for classical music, bluegrass, rockabilly, and most genres of jazz.
 Low brass instruments such as the tuba or sousaphone are the standard bass instrument in Dixieland and New Orleans-style jazz bands.
Jacques-Louis Monod (born February 25, 1927) is a French-born, naturalized American composer, pianist and conductor of 20th century and contemporary music, particularly in the advancement of the music of Charles Ives, Arnold Schoenberg, Anton Webern and uptown music; and was active primarily in New York City and London during the second half of the twentieth century.
The music of Baltimore, the largest city in Maryland, can be documented as far back as 1784, and the city has become a regional center for Western classical music and jazz.
 Early Baltimore was home to popular opera and musical theatre, and an important part of the music of Maryland, while the city also hosted several major music publishing firms until well into the 19th century, when Baltimore also saw the rise of native musical instrument manufacturing, specifically pianos and woodwind instruments. African American music existed in Baltimore during the colonial era, and the city was home to vibrant black musical life by the 1860s.
 Baltimore's African American heritage to the start of the 20th century included ragtime and gospel music.
 By the end of that century, Baltimore jazz had become a well-recognized scene among jazz fans, and produced a number of local performers to gain national reputations.
 The city was a major stop on the African American East Coast touring circuit, and it remains a popular regional draw for live performances.
 Baltimore has produced a wide range of modern rock, punk and metal bands and several indie labels catering to a variety of audiences.
Andy Moor (born 1962) began his musical life in Edinburgh, Scotland playing guitar with Dog Faced Hermans, an eclectic group that mixed post-punk energy with traditional tunes and improvisations.
 In 1990 he moved to the Netherlands after an invitation to join Dutch band The Ex.
 In 1995 he began another group, Kletka Red with Tony Buck Joe Williamson and Leonid Soybelman, fusing traditional klezmer, Greek and Russian songs with their own styles of playing.
Karl Ignaz Weigl (6 February 1881 – 11 August 1949) was an Austrian composer.
 He was born in Vienna, being the son of a bank official who was also a keen amateur musician.
 Alexander Zemlinsky took him as a private pupil in 1896.
 Weigl went to school at the Franz-Joseph-Gymnasium and graduated from there in 1899.
 After that, he continued his studies at the Vienna Music Academy, where he became a composition pupil of Robert Fuchs, and also enrolled at the University of Vienna, studying musicology under Guido Adler, having Anton Webern as a classmate.
 His only opera, "Der Rattenfänger von Hameln", premiered in Vienna in 1932.
Michael Chapman (born 24 January 1941, Hunslet, Leeds, Yorkshire, England) is an English singer-songwriter and guitarist.
 Chapman originally began playing guitar with jazz bands, mainly in his home town of Leeds in The West Riding of Yorkshire.
 He became well known in the folk clubs of the late 1960s, as well as on the 'progressive' music scene, and has recorded over 40 albums to date.
Anton Friedrich Wilhelm (von) Webern (] ; 3 December 188315 September 1945) was an Austrian composer and conductor.
 Along with his mentor Arnold Schoenberg and his colleague Alban Berg, Webern was at the core among those within and more peripheral to the circle of the Second Viennese School, including Ernst Krenek and Theodor W. Adorno.
 As an exponent of atonality and twelve-tone technique, Webern exerted influence on contemporaries Luigi Dallapiccola, Křenek, and even Schoenberg himself.
 As a tutor, Webern guided and variously influenced Arnold Elston, Frederick Dorian (Friederich Deutsch), Matty Niël, Fré Focke, Karl Amadeus Hartmann, Philipp Herschkowitz, René Leibowitz, Humphrey Searle, Leopold Spinner, and Stefan Wolpe.