Utilize the provided motif and the alphabetically represented musical sequence to craft an original musical composition.
X:1
L:1/8
M:6/8
K:Bb
['d2 d- dcB', 'def fdB']  
X:1
L:1/8
M:6/8
K:Bb
|: vF2 vG uB2 uc | d2 d- dcB | d2 d- dcB | cBc dBG | F2 G B2 c | e2 e- efg | fdB (c2 B) | G3 B3 :: 
 def fdB | efg gab | def fdB | cAF (F2 e) | def fdB | efg gab | fdB (c2 B) | G3 B3 :|  