Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
Q:1/4=120
M:6/8
K:D
['AFA d2 e f2 d', 'd2) d/e/ f2 f e2 g f2']  
X:1
L:1/8
Q:1/4=120
M:6/8
K:D
"^Moderately quick" F/G/ | ABA AFA | d2 e f2 d | ABA AGF | (G3 G2) F/G/ | A>BA AFA | d2 e f2 d | 
 ecA ABc | (d3 d2) :: d/e/ | f2 f e2 g | f2 d{e} dcd | ecA{B} AGF | (G3 G2) F/G/ | A>BA AFA | 
 d2 e f2 d | ecA ABc | (d3 d2) :|  