Assertion: trombone | /r/AtLocation | opera
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Trombones were often included in compositions, operas, and symphonies by composers such as Felix Mendelssohn, Hector Berlioz, Franz Berwald, Charles Gounod, Franz Liszt, Gioacchino Rossini, Franz Schubert, Robert Schumann, Giuseppe Verdi, and Richard Wagner among others.