Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
Q:1/8=120
M:2/4
K:D
['A>B AG FA de/f/ gB', 'f2 ge']  
X:1
L:1/8
Q:1/8=120
M:2/4
K:D
 c/B/ | A>B AG | FA de/f/ | gB ed | cB Ac/B/ | A>B AG | FA de/f/ | gB ec | AB/c/ d :: e | f2 ge | 
 fd de/f/ | gB ed | cB Ad/e/ | f2 ge | fe fa | Bd cB |1 AB/c/ d :|2 AB/c/ d2- | d4 ||  