Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:4/4
K:G
['', 'Bc dBGB cAFA', 'Bc d g3 efge']  
X:1
L:1/8
M:4/4
K:G
 Bc |: dBGB cAFA | DGGF GABc | d g3 efge | dBGB A2 Bc | dBGB cAFA | DGG/G/F GABc | d g3 ecAF | 
 GBAF G2 Bc :: d g3 efge | degd e2 Bc | d g3 efge | dBGB A2 Bc | dBGB cAFA | DGAF GABc | 
 dgfg ecAF | GBAF G2 Bc :|  