Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:2/4
K:G
['gd BG']  
X:1
L:1/8
M:2/4
K:G
"G" gd BG | gd BG |"D7" F/G/A/B/ cB | B2 A2 |"G" gd BG | gd BG |"D7" cA GF |"G" G2 G2 || 
"D7" D2 FA |"G" D2 GB |"D7" AA/B/ cB | B2 A2 |"G" G2 B/G/B/d/ | gd BG |"D7" cA GF |"G" G2 G2 :|  