Craft a musical piece in accordance with the designated structure and theme.
X:1
L:1/8
M:4/4
K:G
['', 'G>B d>f g2 g>d', 'b2 a>g'  
X:1
L:1/8
M:4/4
K:G
 G2 |: G>B d>f g2 g>d | e2 e>d g2 g2 | G>B d>f g2 g>d | e<g dB A2 A2 :: b2 a>g fa dB | 
 b2 a>g dc' ba | b2 a>g fa dB | eg dB A2 A2 :|  