Construct a musical composition utilizing the provided motif and conforming to the specified structure.
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
['', 'GFG GFG', 'Bcd ded ded'  
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
 D/"^NB1" |: GFG GFG | GFG Bcd | GFG GFG | ABG FED | GFG GFG | GFG Bcd | efg dcB | AB"^NB2"G FED :: 
 Bcd ded | ded dcB | cde efe | efe edc | Bcd ded | ded def | gfe dcB AB"^NB2"G"^NB3" FED :|  