Develop a musical work using the identified alphabetic pattern and the supplied melody as a theme.
X:1
L:1/8
Q:1/2=96
M:4/4
K:Bb
['BA B2 B,2 B,2 FE D2 B2', 'B2 FE DFBF DFBF G2 E2 E2']  
X:1
L:1/8
Q:1/2=96
M:4/4
K:Bb
"_Allegro" BA | B2 B,2 B,2 FE | D2 B2 BdcB | c2 C2 C2 cB | A2 f2 f2 ga | bagf gfed | ecdf BAGF | 
 GBAc Bdce | d2 B2 B2 || FE | DFBF DFBF | G2 E2 E2 GF | =EGcG EGcG | A2 F2 F2 z2 | B2 f2 f2 ed | 
 ecdf BAGF | GBAc Bdce | d2 B2 B2 |]  