Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
Q:1/8=150
M:2/2
K:Emin
['B eB^c^d efe=d', 'g a^gab =g2 ef']  
X:1
L:1/8
Q:1/8=150
M:2/2
K:Emin
 B | eB^c^d efe=d | BAGF E2 D2 | GBdg eded | A4 z3 B | eB^c^d efe=d | B2 A2 G2 E2 | DdBd edcA |1 
 G4 EFG :|2 GEFA G2 |: ef | gfga f3 g | a^gab =g2 ef | gage deGA | B2 ^D2 EBef | gfga f3 g | 
 a^gab =g2 ef | gabg agfa |1 gef^d e2 :|2 gef^d e4- | e8 |]  