Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
Q:1/4=120
M:2/2
K:Dmin
['A2 AA']  
X:1
L:1/8
Q:1/4=120
M:2/2
K:Dmin
 A2 | dd d2 c2 cc | F3 G A2 BA | (GF) (ED) A3 c | f2 fe d2 c=B | e3 ^G A2 AD | E2 cB A3 A | 
 AG F2 c2 cC | G2 GA B3 B | A2 BG d3 d | g2 gf ed ^cf | F3 F B2 BG | A2 AA D>F E2 | 
 F>A G>B A>d ^c>e | d3 c BABG | A2 AA D2 |]  