Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/2=75
M:2/2
K:Bmin
['D2 DE D2', 'dcdA dcdA']  
X:1
L:1/8
Q:1/2=75
M:2/2
K:Bmin
 D2 DE D2 DE | D2 d2 F2 ED | E2 EF E2 EF | EFGA B2 d2 | D2 DE D2 DE | D2 d2 F2 ED | G2 BG F2 AF | 
 EFGA B2 d2 :: dcdA dcdA | dcdA F2 ED | e2 ed e2 ed | dfed c2 BA | dcdA dcdA | dcdA F2 ED | 
 G2 BG F2 AF | EFGA B2 d2 :|  