Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/4
M:4/4
K:Gmin
['d c', 'B A']  
X:1
L:1/4
M:4/4
K:Gmin
|: d/c/B/A/ G B | A c B d | c e d B | A G ^F D | d/c/B/A/ B d | c e d g | f e d c | B2 B,2 :: 
 d/c/=B/c/ c C | c/B/A/c/ B d | c B A G | A2 D2 | G B A e | d g d B | A G A ^F | G2 G,2 :|  