Craft a musical piece in accordance with the designated structure and theme.
X:1
L:1/4
M:6/4
K:G
['d G', 'a/g/ f'  
X:1
L:1/4
M:6/4
K:G
 G/A/B/c/ d G d G | F A2 c B A | G/A/B/c/ d G d D | D G2 B A G :: g a/g/ f g/f/ | e a/g/ | 
 f d2 f e d | c d/c/ B c/B/ A d/c/ | B (G G) B A G :|  