Develop a piece of music conforming to the stated structure and theme.
X:1
L:1/4
Q:1/4=120
M:4/4
K:Dmin
['D E', 'D3/2 F/ E D c c d/c/A/G/'  
X:1
L:1/4
Q:1/4=120
M:4/4
K:Dmin
"^Rather fast" A, | D3/2 C/ D E |"^(a)" F G E D | G F G/A/ B | A2 D A, | D C D E | F2 E D | 
 G3/2 F/ G B | A3 A | d2 c A | G2 F/G/A/=B/ | c =B c/B/A/G/ | F D C A, |"^(b)" D3/2 F/ D E | 
 F A c d/c/ | A3/2 G/ F/D/ E | D4 |]"^variants (a)" F2 F A | c =B c/B/A/G/ | F D C A,"^Etc" | 
"^(b)" D3/2 F/ E D | c c d/c/A/G/ | F D E F/E/ | D4 |]  