Craft melodious tunes in accordance with the outlined letter representation and the provided thematic element.
X:1
L:1/4
M:4/4
K:G
['G B', 'g f e d']  
X:1
L:1/4
M:4/4
K:G
 G B G B | G B d2 | A3/2 c/ B A | G B d B | c e g e | d B d2 | A B/c/ B A | G2 G2 :| g f e d | 
 g f e d | g f e d | c B A2 | (=f/^f/) e d2 | (=f/^f/) e d2 | d2 A3/2 c/ | B A G2 :|  