Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:2/2
K:G
['D3- D', 'G2 z f (gf)(ef) d3- d (gf)(ga)'  
X:1
L:1/8
M:2/2
K:G
 (B>A) | G2 (GE) D3- D | G2 (GA) (cB)(AG) | (cB)(ce) (dB)(AG) | (AB)(AG) E2 (BA) | G2 (GB) D3- D | 
 G2- G2 g3 f | (ed)(cB) (AB)(cd) | (cB)(AF) G2 :: z f | (gf)(ef) d3- d | (gf)(ga) b3 a | 
 e2 (ge) (dB) (AG) | (AB)(AG) E2 (BA) | G2 (GB) D2- D2 | G2- G2 g3 f | (ed)(cB) (AB)(cd) | 
 (cB)(AF) G2 :|  