Compose a piece of music following the specified structure and theme.
X:1
L:1/8
M:2/4
K:A
['A>B cA BA', 'e>f ec BA'  
X:1
L:1/8
M:2/4
K:A
 A>B cA | BA ce | A>B cA | BA FE | A>B cA | BA (3cde | A>B AF | FE E2 :: e>f ec | BA (3Bcd | 
 e>f ec | BA FE | e>f ec | BA (3cde | A>B AF | FE E2 :|  