Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/4
M:3/4
K:Dmin
['b2 a2 g', 'a3 f2 g2 g f2 e2 e']  
X:1
L:1/4
M:3/4
K:Dmin
|:"_NB1" a"_NB2" b2 | a2 g | f"^+" g2 | a2 a | a"_NB3" b2 | a2 g | f"^+" g2 | a3 :: e"^+" f2 | 
 g2 g | g"^+" f2 |"^+" e2 e | a a f | d g e | f"^+" e3/2 d/ | d3 :|  