Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/4
M:2/4
K:D
['A F']  
X:1
L:1/4
M:2/4
K:D
 D/E/F/G/ | A/B/ A | G/E/ c | A/F/ d | D/E/F/G/ | A/B/ A | G/E/c/e/ | d2 | B B | d c/B/ | A F | 
 A2 | G E | c2 | A F | d2 | B B | d c/B/ | A F | A2 | G E | c e | d2- | d z |]  