Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:4/4
K:D
['defe dBBA B2', 'afdf bafe']  
X:1
L:1/8
M:4/4
K:D
 D3 E F3 A | defe dBBA | B2 d B2 dAB | dfaf e2 dB | AD D2 FDFA | defe dBBA | B2 Ad BdAc | 
 dcdA FD D2 :: f^gab afdf | bafe fedB | d2 f^g a2 fa | bfaf e3 a | faaa afdf | bafe fedA | 
 B2 Ad BdAc |1 dcdA FD D2 :|2 dcdF GEFE :|  