Utilize the alphabetic system of the specified musical pattern and the supplied melodic theme to create a piece of music.
X:1
L:1/8
M:6/8
K:G
['B2 A G2', 'a b2']  
X:1
L:1/8
M:6/8
K:G
 A | B2 A G2 g | f2 g e2 d | B2 A G2 B | (A3 A2) A | BcB G2 g | f2 e d2 c | ABc ecA | d3 d2 :: a | 
 b2 a g2 f | e2 f g2 a | b2 f gfg | (a3 a2) a | b2 a g2 f | efg d2 c | Bcd ecA | (G3 G2) :|  