Compose a piece of music following the specified structure and theme.
X:1
L:1/8
M:2/4
K:D
['dA AF', 'fd de'  
X:1
L:1/8
M:2/4
K:D
 c | dA AF | B/B/B Bc | dA AF | E/E/E Ec | dA AF | B/B/B Bg | fe dc | d2 D :: e | fd de | fd de | 
 fd gf | eA Ae | fd de | fa Ag | fe dc | d2 D :|  