Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:4/4
K:Amin
['A2 AB c2']  
X:1
L:1/8
M:4/4
K:Amin
 A2 BA G2 GE | D2 E2 G4 | A2 AB c2 Bc | B2 BA G4 | c4 d e2 e | d2 dc B4 | A2 AB c2 cB | A2 AG E4 | 
 e3 f g2 ag | e2 dc A4 | c2 cd e2 e2 | d2 dc G4 | A2 AB c2 c2 | c2 cd e4 | d2 dc B2 A2 | 
 G2 cB A4 ||  