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 dBeB dBAB GFGA', 'GFGA B2 AG']  
X:1
L:1/8
M:4/4
K:G
|: Bc | dBeB dBAB | GFGA GDGA | BGBd cBAG | FGAF D2 Bc | dBeB dBAB | GFGA GABc | defe dcAF | 
 G2{A} GF G2 :: (3DEF | GFGA B2 AG | FGAF DEFD | GFGA B2 AG | Adde dcBA | GFGA B2 AG | FGAB c2 Bc | 
 defe dcAF | G2{A} GF G2 :|  