Title: Theory / Unimportant / Art / Instrument / Harmonica

Name: Comb
Definition: main body of the harmonica
Page: https://en.wikipedia.org/wiki/Harmonica
Context: Harmonica
French: Sommier

Name: Reed plate
Definition: grouping of several reeds in a single housing
Page: https://en.wikipedia.org/wiki/Harmonica
Context: Harmonica
French: Plaque d'anche

Name: Cover plate
Definition: cover the reed plates
Page: https://en.wikipedia.org/wiki/Harmonica
Context: Harmonica

Name: Windsavers
Definition: one-way valves glued to the reed plate
Page: https://en.wikipedia.org/wiki/Harmonica
Context: Harmonica

Name: Mouthpiece
Definition: Piece of the harmonica going in the mouth
Page: https://en.wikipedia.org/wiki/Harmonica
Context: Harmonica

Name: Harmonica holder
Page: https://en.wikipedia.org/wiki/Harmonica
Context: Harmonica
Name2: Neck rack

Name: Chromatic harmonica
Definition: Harmonica with a button-activated sliding bar
Page: https://en.wikipedia.org/wiki/Harmonica
Context: Harmonica

Name: Diatonic harmonica
Definition: harmonica designed to play in a single key (at least without overblending/blowing)
Page: https://en.wikipedia.org/wiki/Harmonica
Context: Harmonica

Name: Tremolo harmonica
Definition: Harmonica with two reeds per note, with one slightly sharp and the other slightly flat
Page: https://en.wikipedia.org/wiki/Harmonica
Context: Harmonica

Name: Tremolo
Definition: A rapid change in volume
Page: https://en.wikipedia.org/wiki/Tremolo_harmonica

Question: How does tremolo harmonica obtains tremolo
Answer: Having two slightly different notes playing together, it creates a beats, which increase/decrease the sound periodically
Page: https://en.wikipedia.org/wiki/Tremolo_harmonica

Question: What's the point of having a cover plate
Answer: Directing sound toward the audience
Context: Harmonica
Answer2: They serve as soundboard