Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
Q:3/8=120
M:6/8
K:Amix
['g fed cAc', 'B A2 a acA']  
X:1
L:1/8
Q:3/8=120
M:6/8
K:Amix
 g | fed cAc | ecA A2 g | fed cAc | dBG G2 g | fed cAc | def gfe | agf gfe | dBG G2 :| B | 
 A2 a acA | acA A2 B | A2 a acA | dBG G2 B | A2 a acA | acA acA | agf gfe | dBG G2 :|  