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:Emin
['B2 d2', 'E4 A2 BA F2 ED |1 GFGA']  
X:1
L:1/8
M:4/4
K:Emin
 B2 d2 e3 A | B2 d2 F4 | A2 BA F2 ED |1 GFGA B3 :|2 GFGF E3 || B3 c B2 BA | B2 G2 E4 | 
 A2 BA F2 ED |1 GFGA B3 :|2 GFGF E3 ||  