Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:6/8
K:D
['d2 F AGF']  
X:1
L:1/8
M:6/8
K:D
|:"D" d2 F AGF | d2 F AGF |"A7" A,CE GFG | A,CE GFE |"D" DFA"G" DGB |"A7" Adc"D" d2 e | 
 fed"A7" cBA | GFE"D" D3 ::"D" f3 a^ga | fdd de=f |"C" e=ce gfg |"A7" efd cde |"D" fef"A7" gfg | 
"D" aga"G" bag |"D" fed"A7" cBA | GFE"D" D3 :|  