Create a musical composition following the given alphabetical pattern and incorporating the provided motif.
X:1
L:1/8
Q:1/2=90
M:4/4
K:Bb
['de fd B4 ga b6 ag fdBg', 'f6 de fd B4 _a2 gfed efg_a']  
X:1
L:1/8
Q:1/2=90
M:4/4
K:Bb
 de | fd B4 ga | b6 ag | fdBg ecAf | (3dcB 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 | (3dcB B2 .B2 .B2 | ga b4 ge | (3cBA A2 .A2 .A2 | fg a4 fd | B2 gf edcB | cA F4 E2 | 
 DFBD C2 A2 | B6 :|  