Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
Q:3/8=120
M:6/8
K:D
['A FED AGF B2 A A2 A', 'd2 A def efg fed cde dcB']  
X:1
L:1/8
Q:3/8=120
M:6/8
K:D
 A | FED AGF | B2 A A2 A | dcB edc | dAF D2 A | FED AGF | B2 A A2 A | dcB edc | d3 d2 :: A | 
 def efg | fed cde | dcB Bcd | cBA A2 A | Bdd Add | Gdd Fdd | Edd edc | dAF D2 :|  