Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:4/4
K:A
['(aga)e (dc)(BA) (FB)(BA) (BG) B2 agae ^dfba', 'e2 fdbd ecac dcBA GBed cefg aecA']  
X:1
L:1/8
M:4/4
K:A
|: (aga)e (dc)(BA) | (FB)(BA) (BG) B2 | agae ^dfba | gb^df e2 e2 :: fdbd ecac | dcBA GBed | 
 cefg aecA | BdBG A2 A2 :|  