Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
M:2/4
K:E
['B2 Bc']  
X:1
L:1/8
M:2/4
K:E
 B2 Bc | e4 | fedc | B4 | B2 Bc | e4 | fedc | B4 | B2 Bc | e2 ec | BBec | B3 G | FGFE | CEFG | 
 E3 F | E4 | cecB | cecB | ABAB | A3 B | A3 B | FGFE | CEFG | E3 F | E4 |]  