Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
Q:3/8=112
M:6/8
K:G
['G2 d dcB .A2 B{A} c3 BAG', 'F2 G']  
X:1
L:1/8
Q:3/8=112
M:6/8
K:G
 G2 d dcB | .A2 B{A} c3 | BAG GAB |{AB} A2 G FED | G2 d dcB | .A2 B{A} c3 | BAG c2 B | AGF G3 :| 
 F2 G .A.G.F | F2 G ABc | d2 B d2 B |{GB} .d.B.G .d.B.G | F2 G .A.G.F | F2 G ABc | dBG c2 B | 
 AGF G3 :|  