Respuesta :
The detail in the text that best refines the idea that the Theremin is challenging to play is "It is one of the most difficult instruments to master because even a proficient player requires lots of practice to control the intonation of the musical notes."
This detail shows that mastering the Theremin does not depend on the proficiency of the player. Instead, the Theremin requires adequate preparation to ensure efficient control of the intonation of the musical notes it produces.
Thus, since the Theremin does not need physical contact with the musician, it requires enough practice but remains difficult to master.
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Answer:
even a proficient player requires a lot of practice to control the intonation of the musical notes.
Explanation:
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