Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
Q:1/8=232
M:4/4
K:D
['BA FA D2 FA BA Bd e2', 'fa af eg fe']  
X:1
L:1/8
Q:1/8=232
M:4/4
K:D
|: FG | BA FA D2 FA | BA Bd e2 de | fa af eg fe | df ed B2 dB | BA FA D2 FA | BA Bd e2 de | 
 fa af eg fe | d2 dd d2 :: fg | af df a2 gf | gf ga b2 ag | fa af eg fe | df ed B2 dB | 
 BA FA D2 FA | BA Bd e2 de | fa af eg fe | d2 dd d2 :|  