Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:2/2
K:G
['(A B2) dd d2 ef gfed B2', 'G2 A(G[GB])A B3 B/A/ B2 dd BA'  
X:1
L:1/8
M:2/2
K:G
 (A | B2) dd d2 ef | gfed B2 d2- | dedc (BA) G2 | AGEG D3 :|{_B} =BAGG [GB]A G2 | 
 A(G[GB])A B3 B/A/ | B2 dd BA G2 | AGEG D3 (_B | =B)AGG [GB]A G2 | A(G[GB])A B3 B/A/ | 
 B2 dd BA G2 | AGEG D3 ||  