Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/4
Q:1/2=120
M:4/4
K:G
['B G']  
X:1
L:1/4
Q:1/2=120
M:4/4
K:G
|:"^A""G" B G B/c/ d |"C" e c"D7" A c |"G" B G g G |1"Em" B2"D7" d2 :|2"Em" B2"G" d2 |: 
"^B""D" f a b/a/g/f/ |"Em" e g"A7" g f/e/ |"D" f a"G" b/a/g/f/ |"A7" e2"D" d2 :: 
"^C""C" e c c/d/e/c/ |"G" d B B/c/d/B/ |"Em" g G G A |1"G" B2"G7" d2 :|2"G" B2"D" d2 |]  