Create music compositions that adhere to the given structure and incorporate the provided musical concept.
X:1
L:1/8
M:2/4
K:D
['d/c/B cA', 'Ad f2 eg f2 f a2 b'  
X:1
L:1/8
M:2/4
K:D
|: a2 e2 | d/c/B cA | EA ce | d/c/B cA | aa ee | d/c/B cA | EA ce | d/c/B A2 :: Ad f2 | eg f2 | 
 f a2 b | a/g/f/e/ fd | Ad f2 | eg f2 | f a2 b | a/g/f/e/ d2 :|  