Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/4
M:4/4
K:C
['e/ f/ g']  
X:1
L:1/4
M:4/4
K:C
 c2 B A | G3 G | A A B3/2 A/4 B/4 | c3/2 d/ c G | c2 B A | G3 G | A A B A/ B/ | c2 c2 | c2 B A | 
 G3 G | A A B3/2 A/4 B/4 | c3/2 d/ c G | c2 B A | G3 G | A A B A/ B/ | c2 c2 | e/ f/ g e/ f/ g | 
 f e d G | c2 d e | e2 d2 | e/ f/ g e/ f/ g | f e d G | A2 B2 | c2 c2 | e/ f/ g e/ f/ g | f e d G | 
 c2 d e | e2 d2 | e/ f/ g e/ f/ g | f e d G | A2 B2 | c2 c2 |]  