Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/4
Q:1/2=100
M:4/4
K:C
['G G']  
X:1
L:1/4
Q:1/2=100
M:4/4
K:C
 G G G G | G2 G2 | A A ^G (A/B/) | A2 c2 | c3/2 c/ B A | =G2 G2 | G3/2 G/ G G | G4 |]  