Generate music that aligns with the specified structural requirements.
Only One Section  
X:1
L:1/4
M:4/4
K:D
 D/F/ | A A A G/E/ | F F E E | F F G B | A z2 A | d d d/c/B/A/ | B2 A z | G B/G/ F A/A/ | 
 B A/G/ F E | D2 z |]  