Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
M:2/4
K:none
['F/F/F G/G/G A/A/A ff G/G/G', 'z [K:G] B2 D2 cF F/F/F c2']  
X:1
L:1/8
M:2/4
K:none
[K:D] F/F/F G/G/G | A/A/A ff | G/G/G ee | F/F/F dd | F/F/F G/G/G | A/A/A ff | G/G/G d>c | dd d z :: 
[K:G] B2 D2 |"_c" cF F/F/F |"_c" c2 F2 | ed d/d/d | g2 f2 | eA A/A/A |1 f2 e2 | dG GG/G/ :|2 
 f>e d/"_c"c/B/A/ | GG G z |]  