Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:4/4
K:D
['A2 Ag', 'A2 f>gaf gfed cAea fc e2 f>gaf']  
X:1
L:1/8
M:4/4
K:D
 A2 Ag fdec | A2 A=c BEGB | A2 Ag fdef | g/a/g/f/ gd BA A2 :| f>gaf gfed | cAea fc e2 | 
 f>gaf gfef | g/a/g/f/ gd BA A2 :|  