Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:6/8
K:G
['BcB ABA GAG GFG', 'G2 G/A/ B3 c3 def gde f3']  
X:1
L:1/8
M:6/8
K:G
 G/A/ | BcB ABA | GAG GFG | B3 c2 c | def gdc | BcB ABA | GAG GFG | BdB cAF | AGG G2 :| | G/A/ | 
 B3 c3 | def gde | f3 g3 | def gfg | bbg aaf | def gdB | BdB cAF | AGG G2 :|  