Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:4/4
K:A
['E2 A2', 'a2 ea caAa cAeA']  
X:1
L:1/8
M:4/4
K:A
 E2 |:"A" A2 cA EAce | a2 ga faec |1,3"D" d2 Bd"A" c2 Ac |"Bm" BFBA"E7" GBEG :|2,4 
"D" defd"A" ceaf |"E7" ecdB"A" A2 :: (3efg |:"A" a2 ea caAa | cAeA aAca |"Bm" b2 fb dbBb | 
 dBfB"E7" bBdg |"A" a2 ea caAa | cAeA aecA |"D" defd"A" ceaf |"E7" ecdB"A" A2 :|  