Final answer:
The keyboard instruments that have featured prominently in solo melodies throughout various musical periods include the organ, harpsichord, synthesizer, and electric piano, each with a significant role in different genres and eras.
Step-by-step explanation:
One keyboard instrument featured prominently in a solo melody capacity is: A) Organ B) Harpsichord C) Synthesizer D) Electric piano. All these instruments have been used extensively in various musical periods. The organ has been a mainstay in religious and classical music for centuries. The harpsichord was the keyboard instrument of choice during the Baroque era but lost popularity to the piano in later periods. The synthesizer has become a vital instrument in electronic and popular music since the mid-20th century. Lastly, the electric piano has been a significant presence in genres such as rock, jazz, and R&B.
The evolution of keyboard instruments closely mirrors the historical progress in music and technology. As highlighted in the example regarding the Industrial Revolution, advances in music mechanics led to changes in the composition and performance of music. The piano, with its wider range and dynamic capabilities, ultimately emerged as the symbol of Romantic music, while electrical instruments like synthesizers and electric pianos have opened up new possibilities for composers and performers alike.