Develop a musical composition in line with the given structure and theme.
X:1
L:1/8
M:2/4
K:D
['B AF FE DF FB AF', 'Ad de fd dB'  
X:1
L:1/8
M:2/4
K:D
 B | AF FE | DF FB | AF DF | E3 B | AF FE | DF FB | AF EF/E/ | D3 :| B | Ad de | fd dB | Ad df | 
 e2 ed/B/ | Ad de | fd dB | AF EF/E/ | D3 :|  