Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:4/4
K:G
['B2 B2']  
X:1
L:1/8
M:4/4
K:G
 G2 | B2 B2 B2 B2 | A4 z2 A2 | c2 c2 cedc | B4 z BBc | ddcB g2 e2 | e3 d d2 B2 | B>AAAAedc | 
 c3 B B2 GB | d4 c4 | B4 z2 |]  