Form a musical piece based on the provided motif while observing the defined structure.
X:1
L:1/8
M:4/4
K:D
['b f3 b2 af gfed', 'de fdad bdad feed efga b2 bf'  
X:1
L:1/8
M:4/4
K:D
|: D3 F ADFA | DFAB A3 B | ADD/D/D D2 FA | dAde effa | b f3 b2 af | gfed e2 de | f2 ed BddB |1 
 Adfe dBAF :|2 Adfe d2 fa |: b f3 b2 af | gfed e2 de | fdad bdad | feed efga | b2 bf a3 f | 
 gfed e2 de | f2 ed B2 dB |1 Adfe d2 fa :|2 Adfe dBAF ||  