I want to make sure these answers are right. The answers are put between two stars(*).

1. The overture to A Midsummer Night's Dream is a one-movement work
A. famous for the interplay of piano, violin, and cello.
B. known for the massive sound of the orchestra.
*C. praised for its virtuosic sonata form.*
D. that presents the same basic musical idea in each strophe of the text.

2. When you hear a recurring melody in a programmatic piece like Symphonie fantastique, you're
experiencing which of the following?
*A. Idée fixe*
B. Mode
C. Polyphony
D. Coda

3. The piano trio has been a popular instrument since the middle of the _______ century.
*A. nineteenth*
B. eighteenth
C. seventeenth
D. sixteenth

4. The composer utilized the minor mode in Symphonie fantastique to represent
A. joy and love.
B. earthiness.
*C. gloom and ferocity.*
D. solemnity and brilliance.

5. Franz Schubert was known for having written
A. hundreds of Lieder.
B. four operas.
C. 100 violin concertos.
*D. 11 symphonies.*

6. Which composer called himself a tone poet?
A. Mendelssohn
B. Schubert
*C. Beethoven*
D. Schumann

7. Who wrote a piece in which the third movement is titled "Scene in the Countryside"?
A. Schubert
B. Schumann
*C. Beethoven*
D. Berlioz

8. Which of the following works helped to redefine the symphony as a genre?
*A. Beethoven's Ninth Symphony*
B. Symphonie fantastique
C. Beethoven's Fifth Symphony
D. Beethoven's Sixth Symphony

9. A piano trio is made up of
A. three pianos.
*B. a piano, a violin, and a cello.*
C. a piano, a violin, and a viola.
D. a piano, an organ, and a pianoforte.

10. Prolonged exposure to a volume greater than _______ decibels is considered dangerous.
*A. 80*
B. 50
C. 40
D. 70

11. When the individual movements of a work are linked using a common musical idea, the work as a
whole is commonly described as
A. nationalistic.
B. polyphonic.
*C. cyclic.*
D. harmonic.

12. Clara Wieck Schumann's "Forward!" was written for a/an
A. madrigal choir.
B. brass band.
C. full orchestra.
*D. a capella chorus.*

13. Influenced by Dvořák, _______ is credited as the first American woman to have written a symphony.
*A. Amy Marcy Cheney Beach*
B. Fanny Mendelssohn Hensel
C. Louise Farrenc
D. Clara Wieck Schumann

14. _______ was called the "Valkyrie of the Piano."
A. Louise Farrenc
*B. Teresa Carreno*
C. Clara Wieck Schumann
D. Fanny Mendelssohn Hensel

15. The purpose of a program is to provide listeners with
A. information about who composed the piece and why.
B. the lyrics of the work.
*C. an overview of the dramatic structure of the work.*
D. an explanation of every detail of the piece.

16. In his Fifth Symphony, Beethoven
*A. introduces the short-LONG-short-LONG rhythm.*
B. limits the harmony of the string section.
C. utilizes the percussion section in a whole new way.
D. varies the use of the wind and string instruments.

17. In the overture to A Midsummer Night's Dream, the kingdom of the fairies, led by Oberon and Titania,
is represented by the
A. strings.
B. triangle.
*C. piccolo.*
D. flute.

18. How many singers are required before the group is considered an a cappella chorus?
*A. There should be 8–10 singers to a part.*
B. The number of singers can vary.
C. Only one or two singers per part are all that is needed.
D. Four singers total are needed.

19. If a sound increases 5 dB, the sound becomes _______ times louder.
A. three
B. fifteen
C. five
D. ten

20. In which register is the narrator's voice in Schubert's "Elrkõning"?
A. The softest
B. One of the highest
C. The loudest
D. A neutral one

I can't figure out the answer for the last two questions.

a lot of them are wrong.

19. c

20. d

7. Berlioz

8. fifth
16. varies use of the wind and string instruments
3. is incorrect
1,2,9,10,11,12,13,14,15 are correct

To find the answer to the last two questions:

18. How many singers are required before the group is considered an a cappella chorus?

To answer this question, you need to know what "a cappella" means. "A cappella" refers to vocal music performed without instrumental accompaniment. Typically, an a cappella chorus consists of multiple singers singing different parts. The exact number of singers can vary, but traditionally, an a cappella chorus would have multiple singers per part, usually between 8 to 10 singers to a part. Therefore, the correct answer is:

*A. There should be 8-10 singers to a part.*

20. In which register is the narrator's voice in Schubert's "Erlkö"?

The register refers to the range or pitch of the voice. In Schubert's "Erlkö," the narrator's voice represents different characters in the story, such as the father, the child, and the Erlking. Each character would typically be represented with a different vocal range. Without further information or context, it is difficult to determine which specific register the narrator's voice is in this particular piece. Therefore, it is not possible to determine a definitive answer without additional information.