Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/4
M:6/4
K:Cmin
['G G', 'G G']  
X:1
L:1/4
M:6/4
K:Cmin
 G G G G2 c | B2 A G3 | F3/2 G/ A G2 F | c B A G3 || G G G G2 c | B2 A G3 | F3/2 G/ A G2 F | 
 G2 G F3 ||  