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:2/4
K:G
['B G2', 'c B']  
X:1
L:1/8
M:2/4
K:G
 b | g d2 c | B G2 D | GB A/B/c/A/ | B G2 d | e c2 e | d B2 d | gdcB | B2 A :: G | F A2 c | 
 B G2 c | B d2 =f | e c2 B | A a2 g | f2 (gc) | BGAF | G2 G :|  