Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
Q:1/4=100
M:2/4
K:Ab
['F G']  
X:1
L:1/8
Q:1/4=100
M:2/4
K:Ab
 F2 F G | A2 F2 | c2 c2 | c4 | f4 | c4 | c B A B | c4 | F G A B | B4 | c B A G | F4 | F G A B | 
 c z/ A/ B c | (A4 | A2) (G3/2 F/) | (F4 | F4 | F4) | F4 | F4 |]  