Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/4
M:2/2
K:G
['D G', 'g d']  
X:1
L:1/4
M:2/2
K:G
 G/E/ | D G B G/B/ | A E E/F/ G/E/ | D G B A/B/ | d B B d | e g B d | c/B/ A/G/ A B | 
 D G B/A/ G/A/ | B G G :: B/c/ | d B g d | c/B/ A/G/ A B/c/ | d B/d/ g d | e g g d | 
 e/f/ g/e/ d B/d/ | c/B/ A/G/ A B | D G B/A/ G/A/ | B G G :|  