Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/4=90
M:2/4
K:G
['dB BA/G/', 'B B/c/ dB gB dd dB/c/ dB']  
X:1
L:1/8
Q:1/4=90
M:2/4
K:G
 g | dB BA/G/ | BB Bg | dB BA/G/ | FA AG/A/ | BB (c/B/)(A/G/) | Bd ga | b/a/g/f/ a/g/f/e/ | dB B :: 
 B/c/ | dB gB | dd dB/c/ | dB gf/g/ | aA AG/A/ | BB (c/B/)(A/G/) | Bd ga | b/a/g/f/ a/g/f/e/ | 
 dB B :|  