Produce a music piece that aligns with the mentioned musical structure and theme.
X:1
L:1/8
M:2/2
K:G
['G2 BG', 'b2 af'  
X:1
L:1/8
M:2/2
K:G
|:"_Brisk" G2 BG AcBd | G2 BG cAFD | G2 BG AcBg | fde^c d2 D2 :: b2 af gedB | b2 af gB A2 | 
 b2 af gedc | BGAF G2 g2 :|  