Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/4
Q:1/8=60
M:3/4
K:G
['B G', 'B G']  
X:1
L:1/4
Q:1/8=60
M:3/4
K:G
"^slow" d/c/ | B G G | F G A | B G B | c2 B/c/ |"^5" d g g | d e =f | A F A | c2 d/c/ |"^9" B G G | 
 F G A | B G B | c2 B/c/ |"^13" d g g | d e =f | A G G | G2 || B/c/ |"^17" d g f | g a g | =f d e | 
 =f z d |"^21" g f d | c d c | d B G | F2 c/B/ |"^25" B G G | F G A | B G B | c2 B/c/ | 
"^29" d g g | d e =f | A G G | G2 |]  