Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/4
Q:1/4=120
M:6/8
K:G
['G B d c2 B', 'A c A']  
X:1
L:1/4
Q:1/4=120
M:6/8
K:G
 D E F G2 D | B2 G d2 B | G B d c2 B |1 A c A B2 G :|2 A c A G3 |: G B d c2 B | A2 e d3 | 
 G B d c2 B |1 A c A B2 G :|2 A c A G3 ||  