Empty a soft-drink bottle and practice blowing over the opening as described in section 15.4 until you are able to produce a consistent tone.
a. How does the pitch of this tone vary if you put water in the bottle? What is the relationship of the pitch when the bottle is half-filled to when it is empty? b. Try producing higher harmonics by blowing harder and reducing the opening in your lips. (This is easy for a flute player but takes some practice for other mortals.) How is the pitch of a higher harmonic related to the pitch of the fundamental?
c. By filling eight bottles to different levels, you can produce all the notes of a one-octave scale. Gather a few friends and try playing “Three Blind Mice” or some other simple tune.