Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
Q:1/4=150
M:4/4
K:Gmix
['d BGdG BGGc AFcF AFFc BGdG Bcdf', 'b/a/g a/g/^f']  
X:1
L:1/8
Q:1/4=150
M:4/4
K:Gmix
 d | BGdG BGGc | AFcF AFFc | BGdG Bcdf | egdf BGG :| a | b/a/g a/g/^f gdde | =fdc_B AFFa | 
 b/a/g a/g/^f gddf | eg^fa gGGa | b/a/g a/g/^f gdde | =fdc_B AFFA | GBAc Bdce | dg^fa gGG :|  