Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
Q:1/4=60
M:3/8
K:C
['D2 (3D/D/D/', 'A A>GF/G/ (A<d) z (B<e) z d<f', 'A>GF/G/ A<d z']  
X:1
L:1/8
Q:1/4=60
M:3/8
K:C
 C |[K:D] dffee ad C(3D/D/D/ | D2 (3D/D/D/ | D2 (3D/D/D/ | DFA | d2 (3f/f/f/ | f2 (3f/f/f/ | f2 g | 
 f2 ^e | f2 :: A | A>GF/G/ | (A<d) z | (B<e) z | d<f z | A>GF/G/ | A<d z | c>dg/c/ | [dF]2 :: 
 f/>f/ | f3 f/>f/ | ff/g/f/e/ | dd/e/d/c/ | B2 e/e/ | e2 e/e/ | ee/f/e/d/ | cc/d/c/B/ | A2 A | 
 A>GF/G/ | A<d z | B<e z | d<f z | A>GF/G/ | A<d z | g>ec/e/ | [dF]2 :|  