Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/4
M:4/4
K:G
['B2 A G', 'e2 d2']  
X:1
L:1/4
M:4/4
K:G
 B2 A G | A c B2 | e2 d c/B/ | A e d G | B2 A G | A/B/c/A/ B G | e2 d c/B/ | A/G/A/B/ G2 :| 
 G/A/B/c/ d2 | e2 d2 | g f/e/ d e | d c B A | G/A/B/c/ d2 | e2 d2 | g f/e/ f g | e2 d2 | B2 A G | 
 A c B2 | e2 d c/B/ | A c B G | B2 A G | A/B/c/A/ B G | e2 d c/B/ | A/G/A/B/ G2 ||  