Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:3/4
K:Bmin
['B^A B2 F2', 'B^A B2']  
X:1
L:1/8
M:3/4
K:Bmin
|: de | f2 A2- Af | g4 eg | f2 B2- Bd | c3 c B^A | B2 F2 B2 | B2 G2 B2 | Bc df e^d | e4 e/f/g | 
 f2 A2 f2 | g3 g e/f/g | f2 B2 d2 | c4 B^A | B2 F2 BF | G2 E2 GE | F2 B2 ^A2 | B4 :: A/B/c | 
 d3 c de | d3 f af | e2 ef ed | c3 c B^A | B2 fB bB | g3 A A/B/c | d2 df Bb | ^a2 f2- ff | 
 g2 gf e/f/g | f2 B2- Bc | dc B^A Bd | c2 F2 B^A | B2 F2 B2 | G2 E2- EG | F2 B2 ^A2 | B4 :|  