Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
Q:1/8=120
M:6/8
K:D
['A def fed BdB AFD DFA B2', 'fga agf']  
X:1
L:1/8
Q:1/8=120
M:6/8
K:D
 A | def fed | BdB AFD | DFA B2 A | cee e2 A | def fed | BdB AFD | DFA B2 A | Add d2 :: e | 
 fga agf | gab bag | fga agf | gfg e2 g | fga agf | gab bag | fga efg | fdd d2 :|  