Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
Q:1/8=128
M:4/4
K:A
['A,>C E>G A>c']  
X:1
L:1/8
Q:1/8=128
M:4/4
K:A
|: A,>C E>G A>c e>g | a/g/f/e/ f/e/d/c/ B/A/G/F/ E/D/C/B,/ | A,>C E>G A>c e>g | 
 b/a/g/f/ e<e' c'<a a2 | A,>C E>G A>c e>g | a/g/f/e/ f/e/d/c/ B/A/G/F/ E/D/C/B,/ | 
 A,>C E>G A>c e>g | b/a/g/f/ e<e' c'<a ac' | e'>c' ac' ec' ae' | d'>b ge dB Gb | e'>c' ac' ea ca | 
 b/a/g/f/ e<e' a<a a>c' | e'>c' ac' ec' ac' | d'>b ge d/B/G E/D/B, | A,>C E>G A>c e>a | 
 b/a/g/f/ e<e' c'<a a2 :|  