Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/4
M:3/4
K:G
['B B', 'A G']  
X:1
L:1/4
M:3/4
K:G
 D | G G A | B2 A | B B ^c | d2 d | B B B | A A d | B B B | A A d/d/ | d e ^c | d2 || d/c/ | 
 B A G | d2 G/F/ | E c/B/ A/G/ | G F D/D/ | G G/A/ B/c/ | A2 c/B/ | A G F | G2 ||  