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
['dfd ege', 'afa geg', '']  
X:1
L:1/8
Q:3/8=120
M:6/8
K:D
 dfd ege | cAc dfa | dfd ege | cBc d2 :: afa geg | fdf ecA | afa geg | fad d2 :| d4 |]  