DIFFERENT KINDS OF SOUNDS 107 



11. In stringed instruments what is the original vibrating 

 body ? Does this have to be reenf orced in any way ? Explain the 

 use of the head of a banjo, the sounding board of a piano, or 

 the body of a guitar. Why does a piano give louder sounds 

 than a harp? 



12. What effect upon the pitch of a tone do you produce by 

 tightening the string that caused it ? How does the length of a 

 string affect its tone? Does a heavy or a light string generally 

 give the deeper tone ? 



13. How does a violin player vary the pitch of his tones as he 

 plays ? How is a piano tuned ? 



14. What usually causes the vibrations in a wind instrument ? 

 How are the tones usually made louder ? What is the use of so 

 much tubing in a horn ? 



