Conversation so far:
What was Juvenilia?
Juvenilia are musical or artistic works produced by an author during their youth.
Is there anything interesting in the article on Anton Webern?
Anton Webern's earliest works consist primarily of lieder.
What are Anton Webern's other works?
Other works include the orchestral tone poem Im Sommerwind.
Were Anton Webern's juvenilia recorded?
Anton Webern published little of his early work.

Question: What genre did he play?
Self-contained rewrite: What genre did Anton Webern play?