Select the correct text in the passage, Which detail in the text best refines the idea that the theremin is challenging to play?
The Theremin
The theremin is one of the earliest electronic musical instruments and is played without any form of physical contact between the musician and
the instrument. The Russian physicist Leon Theremin rented this instrument in 1920, and he exhibited his innovation all over the world. The
Instrument has an unusual appearance and consists of two metal antennas, The upright anterna controls the pitch, and the loop antenna
controls the volume. The musician moves his hands over the antennas to create electrical signals, which are magified through the instrument
and relayed to the loudspeaker. The theremin sounds ethereal and transports the listener to another world,
The instrument became very popular in the 1930s, but it soon faded into obscurity due to a lack of interest. However, it was revived in the
1990s, and since then, it has been featured in the soundtracks of many movies. Many composers have created musical symphoniles that
showcase the unique notes of the theremin, it is one of the most difficult Instruments to master because even a proficient player requires a lot
of practice to control the Intonation of the musical notes. Today, mary enthusiasts also build theremins as a hobby using building kits available
online
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