Compose a musical work that seamlessly incorporates the assigned motif and abides by the given alphabetical pattern.
X:1
L:1/8
Q:1/2=100
M:4/4
K:Bb
['de fd B4 ga b6 ag fdBg', '.B2 .B2']  
X:1
L:1/8
Q:1/2=100
M:4/4
K:Bb
 de | fd B4 ga | b6 ag | fdBg ecAf | (3(dcB) .B2 .B2 c2 | defg a2 b2 | g=e c4 B2 | AcfA G2 =e2 | 
 f6 :: de | fd B4 _a2 | gfed efg_a | cdef g=B c2 | GFED C2 cd | ec A4 g2 | fedc defg | Bcde fA B2 | 
 FEDC B,4 | (3(dcB) .B2 .B2 .B2 | ga b4 ge | (3(cBA) .A2 .A2 .A2 | fg a4 fd | B2 gf edcB | 
 cA F4 E2 | DFBD C2 A2 | B6 :|  