Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:4/4
K:G
['G2 BG dG BG', 'gf ed eg'  
X:1
L:1/8
M:4/4
K:G
|: G2 BG dG BG | B2 BA Bc BA | G2 BG dG BG | A2 AG Ac BA | G2 BG dG BG | B2 BA B2 gf | 
 e2 ed Bd ef | ge dB Ac BA :: G2 gf ed eg | B2 BA BcBA | G2 gf ed eg | a2 ab agef | g2 gf ed eg | 
 B2 BA B2 gf | e2 edBd ef | ge dB Ac BA :|  