Compose melodious music utilizing the prescribed letter representation and integrating the given thematic element.
X:1
L:1/8
M:4/4
K:Bmin
['', 'def Bcde f2 e2 c2 e2 a2', 'f2 (3BBB ba b4 abaf ef (3afe']  
X:1
L:1/8
M:4/4
K:Bmin
 def |: Bcde f2 e2 | c2 e2 a2 e2 | Bcde faea | c2 ec B2 f2 :: (3BBB ba b4 | abaf ef (3afe | 
 fbeb dbeb | f2 ec B2 f2 :|  