Create harmonious melodies following the given letter notation and incorporating the designated theme.
X:1
L:1/8
Q:1/2=60
M:2/2
K:G
['G2 GB', 'd2 dege agfd efge af g2 dege']  
X:1
L:1/8
Q:1/2=60
M:2/2
K:G
|: G2 GB AGAB | G2 GB dedB | G2 GB AGAB | dBGB de d2 :: dege agfd | efge af g2 | dege agfe | 
 edBd ef g2 :|  