Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
Q:1/8=110
M:6/8
K:Amin
['A2 e e2 d e>fg B>AG A2', 'B d2']  
X:1
L:1/8
Q:1/8=110
M:6/8
K:Amin
 A2 e e2 d | e>fg B>AG | A2 B c>dB | A e2 A3 || B d2 G3 | B d2 G2 G | A2 B c>BA | c>de A3 ||  