Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:2/2
K:D
['FA A2 GFEd cAec dABG FGAF GFGA', 'BdAg fdfa gfed ceag fdde fdfa gfeg']  
X:1
L:1/8
M:2/2
K:D
 FA A2 GFEd | cAec dABG | FGAF GFGA |1 BGFD EDDE :|2 BGFD EDDg || fd d2 gfeg | fded BdAg | 
 fdfa gfed | ceag fdde | fdfa gfeg | fdfe dcAG | FGAF GFGA | BGFD EDDE ||  