Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/4
M:3/4
K:C
['e d', 'e d']  
X:1
L:1/4
M:3/4
K:C
"^A""C" !>!G3 | !>!G2 z | G F E |"G7" D3 | !>!F3 | !>!F3 | F E D |"C" C3 | !>!G3 | !>!G3 | G A B | 
"F" c3 | c d c |"G7" B A G | f e d |1"C" c z z :|2"C" c z (E/F/)"^B" |:"C" G e d | c2 (E/F/) | 
 G e d | c2 c |"G7" B D3/2 E/ | F2 A |"C" G C3/2 D/ | E z (E/F/) | G e d | c2 (E/F/) | G e d | 
 c2 c |"G7" B d3/2 e/ | f2 B |"C" c z B |1 c z (E/F/) :|2 c z z |:[K:F]"^C""F" F3 | A3 |"C7" (c3 | 
 c) B A | G3 | .E A3/2 G/ |"F" F2 c | f c A | F3 | A3 |"C7" (c3 | c) c3/2 d/ | e d c | B A G | 
"F" F z e | f z z :|  