Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:2/4
K:D
['f2 (fd)', 'd2 a2 (af) b2 (ba) g2 (ge)']  
X:1
L:1/8
M:2/4
K:D
|: f2 (fd) | f2 (fd) | f2 (fd) | (cA)(ec) | f2 (fd) | (gf)(ed) | (cA)(Bc) | d2 d2 :: a2 (af) | 
 b2 (ba) | g2 (ge) | a2 (ag) | f2 (fd) | B2 (ge) | (cA)(Bc) | d2 d2 :|  