Craft a music piece according to the prescribed structure and the input theme.
X:1
L:1/8
M:4/4
K:A
['G>A BG', 'gd dB/d/ ed/B/', 'G4 B>G GA/B/ cB/A/ B4 dB Bc/d/', 'G4 dB/d/ gd ed/B/ d4 BG GA/B/'  
X:1
L:1/8
M:4/4
K:A
 G>A BG AB/A/ G4 | B>c dB cd/e/ d4 | eg dB cd/>c/ B4 | G>A BG AB/A/ G4 :: gd dB/d/ ed/B/ d4 | 
 gd dB/d/ ed/B/ A4 | gd dB/d/ ed/B/ d4 | G>A BG AB/A/ G4 :: B>G GA/B/ cB/A/ B4 | 
 dB Bc/d/ cd/e/ d4 | eg dB cd/c/ B4 | G>A BG AB/A/ G4 :: dB/d/ gd ed/B/ d4 | BG GA/B/ dc/B/ A4 | 
 dB/d/ eg e/d/c/e/ d4 | G>A BG AB/A/ G4 :|  