Compose a piece of music that adheres to the specified alphabetical framework and includes the provided theme.
X:1
L:1/8
M:4/4
K:Bb
['', 'B2 dB fBAB gBaB bBAB FBAB Gc=Bc', 'B2 dB']  
X:1
L:1/8
M:4/4
K:Bb
 F>A |: B2 dB fBAB | gBaB bBAB | FBAB Gc=Bc | AecA BFDF | B2 dB fBAB | gBaB bBAB | FBAB Gc=Bc | 
 AecA BFGA :: B2 dB fBAB | bagf =egfd | B2 dB fdBd | (3cde Ac BFDF | B2 dB fBAB | bagf =egfd | 
 B2 dB fdBd | (3cde Ac BFGA :|  