Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
M:2/4
K:D
['F F']  
X:1
L:1/8
M:2/4
K:D
 F F F F | F E F G | A2 B2 | A3 F | F F F F | F E F G | BA GF | E3 F | F F F E | F E F G | 
 A F G A | B3 A/ A/ | B d c B | A F D F | F2 E2 | D3 z | A2 A2 | A3 z | B2 B2 | B3 B/ A/ | 
 B d c B | A F D F | E2 D2 | D3 z |]  