Although they became an international power in the 16th century, _____ was in decline by the beginning of the 17th century

In chance music

A) the composer constructs a tone-row consisting of 12 tones. B) some or all of the sound combinations are created with only general instructions to the performers. C) unconventional instruments are used. D) all of the above

Benjamin Britten's The Young Person's Guide to the Orchestra

a. was never published or performed. b.demonstrates all the instruments of a symphony orchestra. c.was actually composed by his companion, Peter Pears. d.is too difficult for today's orchestras.