Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/16
M:3/4
K:D
['d2cB A2FA G2EG F2DF E2CE D4 d2cd', 'B2A2 d2dB c2cA B2Bc d2df edcB A4']  
X:1
L:1/16
M:3/4
K:D
 d2cB A2FA G2EG | F2DF E2CE D4 | d2cd e2de f2ef |1 g2fg a2ga b2a2 | a2fa g2eg f2ed | 
 cdef edcB A4 :|2 gfge e4 d4 :: d2Bd c2Ac B2>c2 | d2>f2 edcB B2A2 | d2dB c2cA B2Bc | d2df edcB A4 | 
 d2cB A2FA G2EG | F2DF E2CE D4 | dcdf edeg fdfa | gfgc e4 d4 :|  