Form a musical piece based on the provided motif while observing the defined structure.
X:1
L:1/8
M:4/4
K:D
['', 'A2 F A2 D', 'f2 d f2'  
X:1
L:1/8
M:4/4
K:D
 B |: A2 F A2 D FA | B2 G B2 D GB | A2 F A2 D FA | EFGA GFED | A2 F A2 D F A | B2 G B2 D GB | 
 ABcd efge |1 f2 d2 d3 B :|2 f2 d2 d3 e |: f2 d f2 f df | geaf gfeg | f2 d f2 A df | e2 c e2 A ce | 
 f2 d f2 f df | geaf gfec | adcd efge |1 f2 d2 d3 e :|  