Create harmonious melodies following the given letter notation and incorporating the designated theme.
X:1
L:1/8
M:4/4
K:D
['B3 d A3', 'fgaf g2 bg']  
X:1
L:1/8
M:4/4
K:D
 B3 d A3 B | defd ed (3Bcd | B3 d A3 f |1 af e2 d3 A :|2 af e2 d3 e || fgaf g2 bg | afdf edBA | 
 fgaf g2 bg | af e2 d3 de | fgaf g2 bg | afdf edBA | B3 d A3 f | af e2 d3 A ||  