Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:3/4
K:D
['fa gb ag/f/', 'Ad cd e2- ea']  
X:1
L:1/8
M:3/4
K:D
|: fa gb ag/f/ | ef gb a>g | fa gb ag/f/ | dg fe d2 :: Ad cd e2- | ea gf e2 | Ad cd e2- | 
 ea df d2 :|  