Write a musical work incorporating the specified theme and letter-based framework.
X:1
L:1/8
M:2/2
K:Bb
['F BdcB (GB) FD EGFD GCCA BdcB', 'dfba gfed']  
X:1
L:1/8
M:2/2
K:Bb
 F | BdcB (GB) FD | EGFD GCCA | BdcB (GB)FD | EGFe dBB :| e | dfba gfed | cBed cCCe | dfba bfdB | 
{A} GcFA BB,B,e | dfba gfed | cded cCCE | DFEG FBGE | DFBc dBB ||  