Construct a musical piece that follows the designated lettered structure and integrates the provided motif throughout.
X:1
L:1/8
M:6/8
K:A
['f>ec a2 f>ec']  
X:1
L:1/8
M:6/8
K:A
 e |"A" A>AA c>BA |"A" e2 A f>ec |"A" A>AA"F#m" c>BA |"Bm" f>ec"E7" B2 e |"A" A>AA c>BA | 
"A" e2 A f>ec |"A" a2 e"D" f>ec |"E7" e>dB"A" A2 :| e |"A" a2 e f>ec |"A" B>ce f>ec | 
"A" a2 e"F#m" f>ec |"Bm" B>ce"E7" f2 e |"A" a2 e f>ec |"A" B>ce f>ec |"A" a2 e"D" f>ec | 
"E7" e>dB"A" A2 :|  