Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:2/4
K:C
['', 'A2 Bc', 'Bc e2 ^dc B/c/B/A/ ^GE A2 Bc', 'BA B2 G2 c2 Bc A3 B/c/', 'd>B GB c3 g f>d ef', 'd/e/d/B/ GB c3 g f>d ef']  
X:1
L:1/8
M:2/4
K:C
 E |: A2 Bc | B>A ^GE | A2 Bc | d>c Bc | A2 Bc | B>A ^GE | A>c B^G |1 A3 E ::2 A4 |: A2 Bc | 
 d>c Bc | e2 ^dc | B/c/B/A/ ^GE | A2 Bc | d>c Bc | A>c B^G | A4 :|[M:2/4][K:Emin] c>c Bc | 
 A3 B/c/ | d>c BA | B2 G2 | c2 Bc | A3 B/c/ | d>c BA | G4 :: A>B AG | ^F3 G | A>B cA | B2 G2 | 
 A>B AG | ^F3 G | A>B cA | G4 :|[M:2/4][K:G][Q:1/4=120]"^A""G" d>B GB |"Am" c3 g |"D" f>d ef | 
"G" g>a bg | d>B GB |"Am" c3 g |"D" f>d ef |1"G" g4 :|2"G" g2 g/f/e/d/ |][K:C]"^B""C" c2 e2 | 
 g>f"G" d2 | e>f de |"C" cB"G" A"C"G | c2 e2 | g>f"G" d2 | e>f dB |1"C" c2 c/G/A/B/ :|2"C" c4 |: 
[K:G]"^A' (variante)""G" d/e/d/B/ GB |"Am" c3 g |"D" f>d ef |"G" g/f/g/a/ bg | d/e/d/B/ GB | 
"Am" c3 g |"D" f>d ef |1"G" g4 :|2"G" g2 g/f/e/d/ |]  