Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/16
M:2/4
K:Bb
['BABc Bcde f=efg', 'f2f2f2 vcB Afcf Afcf Bfdf Bfdf gaba']  
X:1
L:1/16
M:2/4
K:Bb
 uF2 | BABc Bcde | f=efg fdcB | f=efg fdcB | AfcA F2(GA) | BABc Bcde | f=efg ffga | bagf =efga | 
 f2f2f2 :: vcB | Afcf Afcf | Bfdf Bfdf | gaba gfed | cBAG FG"^4"AF | BcdB GA=BG | cdec ABcA | 
 Bbag fedc | d2B2B2 :|  