Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
M:6/8
K:Bb
['d2 f edc']  
X:1
L:1/8
M:6/8
K:Bb
 F | BcB d2 f | edc B2 B | edcfed | d2 c3 F | FGFFGF | d3 G3 | F3 z2 f | fed d2 f | edc c2 c | 
 f2 B e2 d | d2 c3 F | BABcBc | d>cd/e/ f2 f | fedcdc | B3 z2 |]  