Construct a musical piece that contains the provided motif and abides by the prescribed alphabetical scheme.
X:1
L:1/8
M:4/4
K:Dmix
['F2 DE', 'dDDg fdad bdad ecgc efga fdad ecgc']  
X:1
L:1/8
M:4/4
K:Dmix
 DE | F2 DE FGAd | cBcG ECCE | FEDE FGAg | fdec dDDE | F2 DE FGAd | cBcG ECCE | F2 DE FGAg | 
 fdec dDDg || fdad bdad | ecgc efga | fdad ecgc | fdec dDDg | fd d2 bdad | ec c2 efga | fdAd cAGc | 
 AFGE FDDE ||  