Choose all the answers that point to 17th-century opera's most direct impacts on the music of Europe and beyond (select all that apply).

a) Use of manufactured sound effects to enhance music.
b) The creation of the popular star-soloist.
c) The trend of not showing violence on stage.
d) Improved instrumental construction for volume, control, and more.
e) The combining of different timbres into one powerful and flexible ensemble.
f) Creating a widespread preference for quiet music with small ensembles.