Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/4
Q:1/4=100
M:4/4
K:C
['c c g g a a g', 'g g'  
X:1
L:1/4
Q:1/4=100
M:4/4
K:C
 c c g g | a a g z | f f e e | d d c2 :: g g f f | e e (e d) | g g f f | (e/c/) (g/e/) d2 | 
 c c g g | a a g2 | f f e e | (d/c/d/e/) c2 :|  