Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/16
Q:1/4=100
M:3/4
K:Gmin
['G^FGA G2B2d2g2 b2ag ^fgaf g2a2 b4 a4', 'GABc d4'  
X:1
L:1/16
Q:1/4=100
M:3/4
K:Gmin
 G^FGA G2B2d2g2 | b2ag ^fgaf g2a2 | b4 a4 g4 | =f2fe d2c2B2A2 | B2fg f2e2 d2c2 | B2fg f2fe d2dc | 
 Bdfb a2g2f2e2 | dcBA B4 B,4 :: dcBc d2d2 e2ed | cBAB c2c2 d2dc | B2>A2 GABc d4 | B2BA GABc d4 | 
 GABc d2g2d2g2 | b2ag ^fgaf g2a2 | b2ag =f2e2d2c2 | BAG^F G8 :|  