Context: There are many styles of mandolin, but four are common, the Neapolitan or round-backed mandolin, the carved-top mandolin and the flat-backed mandolin. The round-back has a deep bottom, constructed of strips of wood, glued together into a bowl. The carved-top or arch-top mandolin has a much shallower, arched back, and an arched top—both carved out of wood. The flat-backed mandolin uses thin sheets of wood for the body, braced on the inside for strength in a similar manner to a guitar. Each style of instrument has its own sound quality and is associated with particular forms of music. Neapolitan mandolins feature prominently in European classical music and traditional music. Carved-top instruments are common in American folk music and bluegrass music. Flat-backed instruments are commonly used in Irish, British and Brazilian folk music. Some modern Brazilian instruments feature an extra fifth course tuned a fifth lower than the standard fourth course.

Question: What are the four common styles of mandolins?
Answer: the Neapolitan or round-backed mandolin, the carved-top mandolin and the flat-backed mandolin.

Question: What is the round-back mandolin made of? 
Answer: strips of wood, glued together into a bowl

Question: Which style of mandolin has a shallower, arched back, and arched top?
Answer: round-back

Question: Which form of music do Neapolitan mandolins feature? 
Answer: European classical music and traditional music.

Question: Which mandolin is commin in American Folk music and blue grass music?
Answer: Carved-top instruments

Question: What type of mandolin has a deep bottom and an arched top?
Answer: Unanswerable

Question: What type of mandolin has an arched back and is braced on the side?
Answer: Unanswerable

Question: What type of American music are the Neapolitan mandolins featured in?
Answer: Unanswerable

Question: What type of European music are the Carved-top instruments featured in?
Answer: Unanswerable

Question:  What are the four uncommon styles of mandolins?
Answer: Unanswerable

Question:  What is the round-front mandolin made of?
Answer: Unanswerable

Question: Which style of mandolin has a deeper, arched back, and arched top?
Answer: Unanswerable

Question:  Which form of music do Neapolitan mandolins not feature?
Answer: Unanswerable

Question: Which mandolin is uncommon in American Folk music and blue grass music?
Answer: Unanswerable