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
['A/ G/- G- G']  
X:1
L:1/4
M:4/4
K:C
 C | C/ C/- C E G | A/ G/- G- G E/E/ | D/ D/- D C B, | D4 | c c/ c/- c c | A/ G/- G- G G/G/ | 
 F E D/ C/- C |]  