Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/16
M:2/4
K:C
['cdef g2g2', 'f2df e2ce d2d2']  
X:1
L:1/16
M:2/4
K:C
 cdef g2g2 | agfa gfed | cdef g2g2 | agfe d4 :: f2df e2ce | d2d2 g4 | f2df e2ce | d2d2 c4 :|  