Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/4
M:3/4
K:C
['g g', 'a2 g']  
X:1
L:1/4
M:3/4
K:C
"G7" g2 f | z e3/2 d/ |"C" d2 c | z B3/2 c/ |"G7" d2 e | f b3/2 a/ |"C" g3 | z d'3/2 c'/ | 
"G7" b2 f | z b3/2 a/ |"C" g2 e | z c3/2 e/ |"G" d g b |"D7" d' c' ^f |"G" g/g/ g g | g z z |: 
[K:G]"D7" (f3 | f) e3/2 d/ |"G" (d3 | d) g3/2 b/ |"D7" (a3 | a) e3/2 f/ |1"G" g b e | B2 z :|2 
"G" g/g/ g g | g z z |:[K:C]"C" g2 c' |"G7" b3 | f2 a |"C" g3 | c e e |"G7" d2 b | a2 g |"C" e2 z | 
 g2 c' |"G7" b3 | f2 a |"C" g3 | g f e |"D7" d ^c d | c'2 ^f |"G" g z z ::"G7" g/f/ e/f/ e/f/ | 
 b2 a |"C" a/g/ ^f/g/ a/b/ | c'2 z |"Dm" a2 d' |"C" c'2 e |"G7" a2 g |"C" c z z :|  