Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
Q:3/8=120
M:6/8
K:D
['a2 f', 'e2 e f2 d cdB A3']  
X:1
L:1/8
Q:3/8=120
M:6/8
K:D
 a2 f a2 f | ded f3 | g2 f g2 f | efd cBA | a2 f a2 f | ded f3 | egf edc | d3 D3 :: e2 e f2 d | 
 cdB A3 | dAd fdf | a2 f e3 | e2 e f2 d | cdB A3 | Bcd edc | d3 D3 :|  