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:G
['(3efg dB GABG AGEF GBdg egdg', 'ea{b}ag fddf']  
X:1
L:1/8
M:2/2
K:G
 GBdg (3efg dB | GABG AGEF | GBdg egdg | egfa gedB | G3 g (3efg dB | GABG AGEF | GBdg egdg | 
 egf"^H"a g2 (dg) || ea{b}ag fdef |{a} gfga bged | ea{b}ag fddf | egfa g2 dg | ea{b}ag fddf | 
 gfga bgef | gfeg a2 ga | bc'ba"^D.C." gedB |]  