Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/8
M:4/4
K:Dmin
['B2 A2']  
X:1
L:1/8
M:4/4
K:Dmin
 D2 | D3 D B2 A2 | G2 DD C2 z2 | D4 D4 | C2 DF G2 Bc | d3 d B2 A2 | GD- D2 C2 B,C | D3 C B,2 C2 | 
 D2 G2 G2 |]  