Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/4=140
M:4/4
K:G
['B2 B>B B2 A2 G>Bd>g e2 d2', 'B2 A2']  
X:1
L:1/8
Q:1/4=140
M:4/4
K:G
 B2 B>B B2 A2 | G>Bd>g e2 d2 | e>gd>g c>gB>g | A2 A>A A>cB>A | B2 B>B B2 A2 | G>Bd>g e2 d2 | 
 e>gd>g c>gB>g | b2 a2 g4 :: d>cB>c d>dc>B | A>Bc>B B2 A2 | G>GG>A B>BB>c | d>dc>B B2 A2 | 
 d>cB>c d>dc>B | A>Bc>B B2 A2 | G>GG>A B>BB>c | d>dc>B"^Da Capo" B2 A2 :|  