Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
M:6/8
K:Eb
['B GABcec']  
X:1
L:1/8
M:6/8
K:Eb
 B | GABcec | B2 A F2 B | GABcec | B3 z2 G | FGFEFG | F>GF E2 B | GABcec | B3 z2 |]  