Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/16
M:3/4
K:Bmin
['D2DF E2EG F2D2 DEFG ABcA d4 f2fa', 'f2d2 f2fa g2gb a2c2 d2f2 efge d4']  
X:1
L:1/16
M:3/4
K:Bmin
 D2DF E2EG F2D2 | DEFG ABcA d4 | f2fa g2f2 e2d2 |1 cdef edcB AGFE :|2 cdec d8 :: f2fa g2gb a2c2 | 
 d2f2 efge f2d2 | f2fa g2gb a2c2 | d2f2 efge d4 | D2DF E2EG F2D2 | DEFG ABcA d4 | f2fa g2f2 e2d2 | 
 cdec d8 :|  