Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
M:4/4
K:Dmix
['FDAD FAAB', 'd2 ed']  
X:1
L:1/8
M:4/4
K:Dmix
 FDAD FAAB | cAAG EFGE | FDAD FAAB | cAGE FD D2 | FD D2 FAAB | cAAG EFGE | FDAD FAAB | 
 cAGE FD D2 || FDFA d2 ed | cAAG EFGE | FDFA d2 ed | cAGE FDAD | FDFA d2 ed | cAAG EFGE | 
 FD D2 d2 ed | cAGE =F4 ||  