Create harmonious melodies following the given letter notation and incorporating the designated theme.
X:1
L:1/8
M:2/4
K:G
['GB BA/G/ FA', 'A2 B/c/d ef g2 f/g/f/e/ dg fe', 'cB/A/ GB BA/G/ FA A>B cA FA', 'A>B cA FA |1 G2 GB/c/ :|2']  
X:1
L:1/8
M:2/4
K:G
 GB BA/G/ | FA AB/A/ | GA Bc | d2 cA | GB BA/G/ | FA A>B | cA FA |1 G2 GD :|2 G2 GB |: dg fe | 
 fA A2 | B/c/d ef | g2 f/g/f/e/ | dg fe | fA A>B | cA FA |1 G2 GB :|2 G2 GD |: 
"^variations" GB BA/G/ | FA A2 | GA Bc | d2 cB/A/ | GB BA/G/ | FA A>B | cA FA |1 G2 GD :|2 
 G2 GB/c/ |: dg f>e | fA A>B | cd ef | g2 f>e | dg f/g/f/e/ | fA A>B | cA FA |1 G2 GB/c/ :|2 
 G2 GD ||  