Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
Q:1/4=80
M:4/4
K:Ador
['(c<A) A>B', "a>b c'>a a>b"]  
X:1
L:1/8
Q:1/4=80
M:4/4
K:Ador
"^Andante" (A>B) | (c<A) A>B c<A A(e/d/) | c>A (A/G/).F/.E/ G2 A>B | (c<A) A>B (c<A) A>B | 
 c>d (e/d/)(c/B/){B} A3 B | c>d e>d e>d c>d | ed (d/c/B/A/) G2 c>B | A>B c>d e>d c<a | 
 g>e (e/d/).c/.B/{B} A2 || a>b | (c'<a) a>b c'a a(e'/d'/) | c'>a (a/g/).f/.e/ g2 a>b | 
 c'>a a>b c'>a a>b | c'>d' (e'/d'/).c'/.b/ a3 b | c'>d' e'>d' e'>d' a>d' | 
 e'>d' (d'/c'/)b/a/ g2 c'>b | a>b c'>d' e'>d' c'>a | g>e (e/d/).c/.B/{B} A2 |]  