Final answer:
The harmonica is made from reed plates, cover plates, and a comb. This wind instrument uses resonance to amplify the sound produced by the player's breath vibrating the reeds.
Step-by-step explanation:
The musical instrument traditionally made out of reed plates, cover plates, and a comb is the harmonica. Although not specifically mentioned in the provided references, it's a well-known fact that the harmonica's reed plates contain the reeds which vibrate to produce sound when the player breathes through them. The comb serves as the main body of the harmonica, with chambers that direct air to the reeds, and the cover plates protect the reed plates and are generally where the musician places their lips to play.
Wind instruments, including the harmonica, use resonance to amplify sound. Resonance in musical instruments has been used since prehistoric times, as illustrated by the marimba mentioned in the references, which uses gourds to amplify its sound. Similarly, the harmonica uses its compact structure to create resonance within the air columns created by its design.