Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/4
M:4/4
K:G
['d- d', 'f a2 g/f/ g b2 a/g/']  
X:1
L:1/4
M:4/4
K:G
 g | f d- d e/f/ | g G G g | f d d/e/f/d/ | g3 a/g/ | f d- d e/f/ | g d- d c | B2 A2 | G3 :: g | 
 f a2 g/f/ | g b2 a/g/ | f a2 g/f/ | g b2 a/g/ | f/g/ a d e/f/ | g d2 c | B2 A2 | G3 :|  