Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:3/4
K:C
['cGcedB dccefa aggGBd', 'cBBdgb baadfa', '', "ege c'2 a2 a_b a3 gfe e2"]  
X:1
L:1/8
M:3/4
K:C
 G2 | cGcedB | dccefa | aggGBd | feeGEG | cGcedB | dccefa | aggGBd | c4 ::[K:G] ce | eddcAc | 
 cBBdgb | baadfa | aggGBd | dccAAc | cBBdgb | baadfa | g4 :|[K:C] gf |: e3 fge | c3 ege | 
 c'2 a2 a_b | a3 gfe | e2 d2 d2 |1 g4 ag | fedefg | e4 gf ||2 B3 GAB | cBcedB | c4 :|  