Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:4/4
K:D
['d2 ed f2 ed BE EB AFAB', 'fdad fd (3ddd fdaf geeg']  
X:1
L:1/8
M:4/4
K:D
 A3 B d2 ed | f2 ed BE EB | AFAB dBAF | GAFG EFFE | AFAB d2 ed | f2 ed BE EB | AFAB dfaf | 
 gafg e2 eg || fdad fd (3ddd | fdaf geeg | fdad fdBd | AFGE FDDg | fdad fd (3ddd | fdaf geeg | 
 fbaf gfef | afef dBAF ||  