Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:2/2
K:G
["GBdg g2 g2 dfac' c'2 c'2 bgc'a", "g4 bgbd' c'bag agea gfed edef gded"  
X:1
L:1/8
M:2/2
K:G
|: GBdg g2 g2 | dfac' c'2 c'2 | bgc'a d'bag | ac'ea gfed | GBdg g2 g2 | dfac' c'2 c'2 | 
 bgc'a d'be'c' | bag^f g4 :: bgbd' c'bag | agea gfed | edef gded | cdAd cBAG | GBdg g2 g2 | 
 dfac' c'2 c'2 | bd'gb egce | BAGF G4 :|  