Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/8
M:12/8
K:D
['B2 A', 'B2 A']  
X:1
L:1/8
M:12/8
K:D
|: dcB | A2 A A2 A ABA F2 E | DFA B2 A B2 A F2 A | dcd a2 g f2 d B2 A | BdA BAB d3 :: d2 A | 
 dcd a2 g f2 d B2 A | BdA BdA B2 A F2 A | dcd a2 g f2 d B2 A | BdA BAB d3 :|  