Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/4
Q:3/4=90
M:6/4
K:G
['B3/2 c/ B B2', 'A3- A2 B']  
X:1
L:1/4
Q:3/4=90
M:6/4
K:G
 D | G3/2 A/ G G2 A | B3/2 c/ B B2 c | d3/2 e/ d c2 B | A3- A2 g | c3/2 d/ c c2 g | 
 B3/2 c/ B B2 d | A3/2 B/ G F D F | G3- G2 :: d | d3/2 e/ d g2 d | d3/2 e/ d e2 d | e f g f g a | 
 f3 f3/2 g/ a | A B c E A ^G | A3- A2 B | c B A G2 ^G | A3- A2 B | A3/2 B/ A A E A | F3 D2 A | 
 d2 e d c B | A3- A2 B | G F E c B A | F E D B A G | F D G TG2 F | G3- G2 :|  