Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:2/4
K:C
['GGGA G2']  
X:1
L:1/8
M:2/4
K:C
 G2 GA | G2 EE | GGGA | G2 E z | GGGA | G2 EE | GGGA | G2 E z | G2 G2 | c4 |]  