Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/16
M:3/8
K:D
['d2f2d2 a4 f2', 'd4 e2 f2afaf e2gege f2afaf e2c2A2 d2f2d2']  
X:1
L:1/16
M:3/8
K:D
 A2 | d2f2d2 | a4 f2 | g2bge2 | cdecA2 | d2f2d2 | a4 f2 | g2bgec | d4 :| e2 | f2afaf | e2gege | 
 f2afaf | e2c2A2 | d2f2d2 | a4 f2 | g2bgec | d4 :|  