Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:4/4
K:G
['GABc dg g2', 'dg g2']  
X:1
L:1/8
M:4/4
K:G
|: Bc | dBGB | cAFA | G2 (3AGF GABc | dg g2 efge | dBGB A2 (3ABc | dBGB cAFA | GDBD GABc | 
 dg g2 ecAF | G2 (3AGF G2 :: Bc | dg g2 efge | dg g2 eg g2 | dg g2 efga | bgdB A2 Bc | dBGB cAFA | 
 BGGF GABc | dg g2 ecAF | G2 (3AGF G2 :|  