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
Q:1/4=112
M:4/4
K:G
['BB BA/G/', 'dBB B/c/ dBgB dd dB/c/ dB gf/g/']  
X:1
L:1/8
Q:1/4=112
M:4/4
K:G
"^Allegretto" G/A/ | BBBA/G/ dB BG/A/ | BB BA/G/ BA AG/A/ | BB BA/G/ AB g>a | 
 b/a/g/f/ e/f/g/e/ dBB :: B/c/ | dBgB dd dB/c/ | dB gf/g/ aA AG/A/ | BB BA/G/ AB g>a | 
 b/a/g/f/ e/f/g/e/ dBB :|  