Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:2/4
K:Dmin
['DF Ad/e/', 'a2 BG/B/ dB gd b2 aa/b/ ag']  
X:1
L:1/8
M:2/4
K:Dmin
|: DF Ad/e/ | fe dA | DF Ad/e/ | b2 a2 | DF Ad/e/ | fe dA |1 BB/A/ Bc | d2 d2 :|2 A/B/A GA | 
 D2 D2 |: AF/A/ dA | fd a2 | BG/B/ dB | gd b2 | aa/b/ ag | fe dA | BB/A/ GF | D2 D2 :|  