Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:2/4
K:D
['FA GB Af', 'B2 c/B/A/B/'  
X:1
L:1/8
M:2/4
K:D
|: FA GB | Af f2 | Ge e2 | Fd d2 | FA GB | Af fe/f/ | ge e/g/f/e/ |1 d2 dA/G/ :|2 d2 dB/=c/ |: 
[K:G] dg Bc/B/ | GA B2 | c/B/A/B/ cd | ed dB/c/ | dg Bc/B/ | GA B2 | c/B/A/B/ cB |1 AG GB/c/ :|2 
 AG G2 ||  