Develop a musical composition in line with the given structure and theme.
X:1
L:1/8
M:6/8
K:Bb
['B,CD EFG FGA B3 GAB cdB A3', 'B,3 FGF DED FGF B3 GAB cdB'  
X:1
L:1/8
M:6/8
K:Bb
 B,CD EFG | FGA B3 | GAB cdB | A3 F3 | fed gfe | dcB A>GF | Bcd FGE | D3 B,3 :: FGF DED | FGF B3 | 
 GAB cdB | A3 F3 | bag fed | cdB AGF | GAB FGE | D3 B,3 :|  