Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
Q:1/8=160
M:6/8
K:D
['g a^ga bag afd Ade fef g2', 'agf g3', 'f2 A']  
X:1
L:1/8
Q:1/8=160
M:6/8
K:D
 g | a^ga bag | afd Ade | fef g2 f | efe B3 | efe dcB | Ace a3 |1 a^ga ba=g | f3- f2 :|2 
 a^ga b2 c | d3- d |] AB |: def agf | g3 e2 f | gba gfe | f2 A f2 A | f3- f2 e | dcB A3 |1 
 a^ga ba=g | f3- fAB :|2 a^ga b2 c | d3- d3 |]  