Generate a piece of music. The title is The traditional tunes of the Child ballads.  
X:1
T:Music21 Fragment
L:1/4
M:4/4
I:linebreak $
K:G
V:1 treble 
V:1
 D | G G B B | A A D D | G D G A/B/ | A2 z B/>c/ | d d/d/ c/B/ A/A/ | A/c/ B/A/ G B/B/ | %7
 A D E/E/ F | G2 z x || %9  