Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:2/4
K:Emin
['EB BA/B/ cB A/G/F/G/ AA BA']  
X:1
L:1/8
M:2/4
K:Emin
|:"Em" EB BA/B/ |"C" cB A/G/F/G/ |"D" AA BA |"G" G/F/E/F/"Bm" GF |"Em" EB BA/B/ |"C" cB A/G/F/G/ | 
"D" AA BA |"Bm" G/F/E/F/"Em" E2 ::"Em" ee fg/f/ |"C" ee f/e/f/g/ |"D" ab ba |"G" g/f/e/f/"Bm" gf | 
"Em" ee fg/f/ |"C" ee f/e/f/g/ |"D" ab ba |"Bm" g/f/e/f/"Em" e2 :|  