Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/4
M:3/4
K:Dmin
['D A G F3/2 G/ A', 'F3/2 G/ A']  
X:1
L:1/4
M:3/4
K:Dmin
 D A G | F3/2 G/ A | F E D | C3/2 D/ E | D A G | F3/2 G/ A | A f e | d3 |] A d d/c/ | A d c | 
 F c A/G/ | F3/2 G/ A | A A G | F3/2 G/ A | G/F/ D C/E/ | D3 |]  