Develop musical pieces that conform to the specified format and include the suggested musical theme.
X:1
L:1/8
M:4/4
K:Bb
['F B2 Bf (dB)Bd e2 ec (AF)FB', 'B F B2 Bd (bf)dB G2 ce'  
X:1
L:1/8
M:4/4
K:Bb
 F | B2 Bf (dB)Bd | e2 ec (AF)FB | d2 dB (GE)EG | FBAc B2 B :| F | B2 Bd (bf)dB | G2 ce (ge)cB | 
 Acf=e fdcB | cf=eg fefa | babf dBBd | edec AFFB | d^cdB GEEG | FBAc B2 B ||  