Create harmonious melodies following the given letter notation and incorporating the designated theme.
X:1
L:1/8
Q:1/4=100
M:2/4
K:Gmin
['dd de dc BG']  
X:1
L:1/8
Q:1/4=100
M:2/4
K:Gmin
 dd | de dc | BG GG | GG GA | B2 B2- | B z dd | de dc | BG FF | FB AG | G2 G2- | G z ||  