Develop a musical composition that aligns with the given structural outline and thematic content.
X:1
L:1/4
M:4/4
K:G
['B A']  
X:1
L:1/4
M:4/4
K:G
 D | G G G/G/G/G/ | E E D D | E E/E/ F D | G2 z G/A/ | B3/2 A/ B d | c B A z | A/>A/A/A/ A d/c/ | 
 B A G G/A/ | B B A A | G3/2 B/ d d/c/ | B G B A | G2 z |]  