Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:2/2
K:C
['cded cBAG', 'cBcd ea{b}ag agef |1', 'cBcd eaag edde :|2 gefd ecdc Bcdf']  
X:1
L:1/8
M:2/2
K:C
 B | cded cBAG | Addc dcAB |1 cded cBAG | AcGE EDD :|2 cABG AFGE | FDGF ECC |] f |: gage{d} cBcd | 
 ea{b}ag agef |1 gage{d} cBcd | eaag edde :|2 gefd ecdc | Bcdf ecc |]  