Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:2/4
K:G
['d3 _f (3e_fg c2 (3^fga df', 'd3 e cB/A/', 'A BGGB', 'G4 D2 d2 dc/B/ c2 D2 c2']  
X:1
L:1/8
M:2/4
K:G
 d3 _f | (3e_fg c2 | (3^fga df | g/f/g/a/ g2 | d3 _f | (3e_fg c2 | (3^fga df | g2 G2 :: d3 e | 
 cB/A/ BG | d3 e | cB/A/ B2 | d3 _f | (3e_fg c2 | (3^fga df | g2 G2 :| 
[M:2/4]"^Trio" !fermata!G3 A | BGGB | cAFD | G/F/G/A/ G2 | G3 A | BGGB | cAFD | G4 :: D2 d2 | 
 dc/B/ c2 | D2 c2 | cB/A/ B2 | G3 A | BGGB | cAFD | G2 G,2 :|  