Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:2/2
K:G
['efe^c d2', '[GB]2 B3 B B2 B2 dBAG ED'  
X:1
L:1/8
M:2/2
K:G
 g2 gg f2 g2 | efe^c d2 (fg-) | g2 ga a2 a2 | bage d2 ef | g2 ga gedg | efe^c d2 d2 | dBGB AFAG | 
 (G[GB])GG [GB]2 :: B3 B B2 B2 | dBAG ED B,2 | B,2 D2 G2 G2 | (AB-)B_B- B2 _B2- | B2 dd d2 ee | 
 dBAG E2 D2 | B,CDD E2 GG | G3 G [GB]4 :|  