Craft a musical work adhering to the specified theme and structure.
X:1
L:1/4
M:4/4
K:D
['z F/A/A/A/ A/A/ A B A']  
X:1
L:1/4
M:4/4
K:D
 A, |"D" D/D/D/D/ D/D/ E | F D B, D | D3 z | F/A/A/A/ A/A/ A | B A F A |"A" A3 z | 
 F/A/A/A/ A/A/ A | B A F2 |"G" E D D D | F D B, A, |"D" D3 F |"A" E3 F |"D" D3 |]  