Craft a musical composition that incorporates the supplied alphabet sequence and motif.
X:1
L:1/8
Q:1/2=80
M:2/2
K:Eb
['(D2 E2)', '', 'BABd cAFD']  
X:1
L:1/8
Q:1/2=80
M:2/2
K:Eb
 (D2 E2) (e2 d2) | (D2 E2) (c2 B2) | B,CDE FGAG | BAGF EDCB, | (D2 E2) (e2 d2) | (D2 E2) (c2 B2) | 
 B,CDE FGAG | BAGF E2 z2 ::[K:Bbmix] |: BdcA BfdA | BdcA BfdA | bBaB gBfB | edcA BAGF | BABd cAFD | 
 BABd cAFD | f2 g2 a2 b2 | (3fgf (3edc B2 z2 :|  