Short mood pieces of no set form are called _____.

a. tone poems
b. preludes
c. overtures
d. mazurkas

B?

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Yes, the correct answer is b. preludes.

Preludes are short mood pieces of no set form that were highly popular during the Romantic era of classical music. They were usually written for piano and were used to introduce and explore a specific musical idea or emotional atmosphere.

To arrive at this answer, it is helpful to have some knowledge of music history and terminology. If you are unsure about the answer, you can also use the process of elimination:

- Tone poems (option a) refer to a type of orchestral music that tells a story or describes a non-musical concept.
- Overtures (option c) are the opening pieces of an opera or ballet.
- Mazurkas (option d) are a type of Polish folk dance with a distinct rhythm and character.

By ruling out these options, you can determine that b. preludes best fit the description of short mood pieces with no set form.