Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
M:4/4
K:C
['fdcd cBGF']  
X:1
L:1/8
M:4/4
K:C
|: c2 ge fdcd | cBGF DEFD | Gc c2 gceg | fdcd cBGF | Ecde efdc | BdGA _B=BcG | dg g2 defa | 
 gfdc BGFD :|  