Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:2/4
K:G
['z B>A GB A z A2 cB', 'G z g2 gf fe e2 a2'  
X:1
L:1/8
M:2/4
K:G
|: z | B>A GB | A z A2 | cB Ac | BG G2 | Bd ef | gd ec | BA GF | G2 G :| z | g2 gf | fe e2 | 
 a2 ag | fd d2 | gf gf | ed eg | fd e^c | dc BA | B>A GB | A z A2 | cB Ac | BG G2 | Bd ef | gd ec | 
 BA GF | G2 G ||  