Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:2/2
K:D
['', '=c>B cE (ED)']  
X:1
L:1/8
M:2/2
K:D
"^A" |: (F/G/ |"D" A)(D FA) | (dc) (GB) |1,3"C" =c>B cG |"^*A7" (ED) G :|2,4"C" =c>B cE | (ED) D :| 
"^B" |: z/ (e/ |:"D" fd) (ed) |"A7" (cA) |1,3 A>(e |"D" fd) (ef) |"A7" (ag) e>g :|2,4 (AB) | 
"C" =c>B cE |"D" (ED) D :|  