What innovation enabled the Impressionists to paint en plein air?

Music such as this selection was intended by its composers to be performed by?

a) highly-trained musicians b) cultivated amateurs c) children d) musicians with next to no training

Who took over the role of the impresario in operatic management during the late nineteenth century?

A) the composer B) the theater's board of directors C) publishing firms D) the singer's union