He also attended master classes with Wolfgang Rihm and Heinz Holliger.

Entity and relation annotations:
id: 0
type: entity
value: text: Wolfgang Rihm
labels: <Person>
id: 1
type: entity
value: text: Heinz Holliger
labels: <Person>
type: relation
to_id: 1
labels: Person:business/work:Person
from_id: 0