Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:3/8=110
M:6/8
K:G
['c3 B3', 'cde/f/ gdB ABG F2 D', 'GAG BAB']  
X:1
L:1/8
Q:3/8=110
M:6/8
K:G
|:"^A" A/B/ | c3 B3 | ABG F2 D | GAG BAB | GAG BAB | c3 B3 | ABA fef | g2 d edc | B3 G2 ::"^B" B | 
 cde/f/ gdB | ABG F2 D | G2 c BAB | G2 c BAB | cde/f/ gdB | ABG F2 D | gfe dec | B3 G2 :: 
"^C" A/B/ | cAc BGB | ABG FED | GAG BAB | GAG BAB | cAc BAB | cAc fef | g2 d edc | B3 G2 :|  