Compose a piece of music that adheres to the specified alphabetical framework and includes the provided theme.
X:1
L:1/4
Q:1/4=120
M:4/4
K:Bb
['F B']  
X:1
L:1/4
Q:1/4=120
M:4/4
K:Bb
 F | B F G G | F E D D | E D C F | F =E F F | B c d B | e d c d | B G F B | B A B |]  