Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
Q:1/4=120
M:6/8
K:Gmin
['spirit, but not too G>AG F2 D', 'G3 f>ag f2 d g>ab{b} a2 g']  
X:1
L:1/8
Q:1/4=120
M:6/8
K:Gmin
"^With spirit, but not too fast." G>AG F2 D | B>cB A>Bc | d>ed c2 B | f3 d3 | Bcd/e/ f2 d | 
 c>AF FGA | B2 G AFD | B3 G3 |] f>ag f2 d | g>ab{b} a2 g | fdb fdB | f3 gab | f<dB Bfd | cAF FGA | 
 BAG AFD | B3 G3 |]  