Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/4
Q:3/4=80
M:6/4
K:Gmin
['d e', 'g f']  
X:1
L:1/4
Q:3/4=80
M:6/4
K:Gmin
 e/f/ | g3 f3/2 e/ d | e g c =B3/2 c/ d | e .d c B3/2 A/ G | _A F3/2 E/4F/4 G2 || G/_A/ | 
 B3/2 c/ B e2 e/4f/4 g | f e/d/c/B/ B2 b | g3/2 f/ e d e d/c/ | g3 g2 f | e d c =B c d | 
 e f g _a2 g | f e/d/ e G c =B | (c3 c2) |]  