Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:4/4
K:D
['(3DDD FD ADFD Acde fded cAAB =c2', 'd2 fd a2 fd']  
X:1
L:1/8
M:4/4
K:D
 (3DDD FD ADFD | Acde fded | cAAB =c2 =cd | eaag edd_d | (3DDD FA defd | cAAB cdeg | fdec d2 cA | 
 BdcA FDD z :: d2 fd a2 fd | ecAB cdec | d2 fd a2 fd | cdeg fd d2 | d2 fd a2 fd | cdef g2 fg | 
 (3agf ge fdec | dfeg fdd z :|  