Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
Q:1/2=80
M:2/2
K:none
['AA/A/ f2 ed e2', 'AA/A/ aA aAaA']  
X:1
L:1/8
Q:1/2=80
M:2/2
K:none
 AA/A/ f2 ed e2 | BB/B/ g2 dBGB | AA/A/ f2 ed e2 | EE/E/ FG A2 A2 :: AA/A/ aA aAaA | 
 BB/B/ gB gBgB | AA/A/ aA aAaA | EE/E/ FG A2 A2 :|  