The human voice: a. is an unnatural musical instrument. b. is limited in character and range. c. possesses lyric beauty and expressiveness that has served as a model for instrument builders and players. d. can be made to sound like any instrument.

c. possesses lyric beauty and expressiveness that has served as a model for instrument builders and players.

The human voice is known for its unique ability to convey a wide array of emotions and subtleties that can captivate an audience. Its expressiveness comes from the human ability to modulate pitch, tone, and tempo, which allows for the communication of different feelings and ideas through song or speech. The qualities of the human voice have inspired instrument makers throughout history; they have tried to emulate these qualities through the design of musical instruments, allowing them to produce sounds that can rival the expressiveness of the voice. Additionally, instrumentalists often strive to make their instruments "sing," aiming to achieve a sound quality that closely resembles the warmth and expression inherent in the human voice.