Design a musical work that abides by the outlined structure and integrates the assigned theme.
X:1
L:1/4
M:4/4
K:G
['G A', 'd c3/2 d/ e c d4 B3'  
X:1
L:1/4
M:4/4
K:G
 B/A/ | G3/2 A/ B A | G3/2 A/ B A | G A B c | d4 | B3 d | d B G A |1 B2 A G | A3 :|2 B2 A2 | 
 G A B c |: d2 g3/2 f/ | e3 d | c3/2 d/ e c | d4 | B3 d | d B G A |1 B2 A G | A3 B/c/ :|2 B2 A2 | 
 G3 ||  