Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/8
Q:1/2=90
M:2/2
K:Bb
['Bcde fBAB gBaB bBAB GBFB EBDB', 'gBaB bBAB']  
X:1
L:1/8
Q:1/2=90
M:2/2
K:Bb
 Bcde fBAB | gBaB bBAB | GBFB EBDB | cedc BAGF | Bcde fBAB | gBaB bBAB | GBFB EBDB | ecBA B2 B2 :: 
 fBAB gBAB | gBaB bBAB | gabg gfed | edcB BAGF | Bcde fBAB |"^bar missing in MS" gBaB bBAB | 
 GBFB EBDB | ecBA B2 B2 :|  