Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:6/8
K:D
['', 'FAD FED', 'd2 e f2 d edB BAF', 'efg fad cBA']  
X:1
L:1/8
M:6/8
K:D
 AG |: FAD FED | (3FGAD FED | GBG FAF | EFE EFG | (3FGAD FED | FAD FED | dcB AFA | DED D3 :: 
 d2 e f2 d | edB BAF | ABA ABd | efd edB | d2 e f2 d | edB BAF | dcB AFA | DED D3 :: dB/c/d efg | 
 fad cBA | B3 AFD | EFE E2 A | dcd efg | fad cBA | BdB AFA | DED D3 :|  