Compose a piece adhering to the given musical structure and theme.
X:1
L:1/8
M:2/4
K:D
['D D']  
X:1
L:1/8
M:2/4
K:D
 d | A F G E | D D D D | D D F A | d A z d | A F G E | D E F d | c A B ^G | A A z A | d e f d | 
 c d e A | e e d c | d2 A A | d e f d | e c d D | F/ F/ G A F | E2 D z |]  