Craft a musical piece in accordance with the designated structure and theme.
X:1
L:1/8
M:4/4
K:G
['BDGB DGBd gBdg', 'B4 G4 Bcdc BcdB'  
X:1
L:1/8
M:4/4
K:G
 BDGB DGBd | gBdg BdgB | bagf agfe | dedc BcA^A | BDGB DGBd | gBdg Bdgb | agfe dedc | B2 A2 G4 :| 
 B4 G4 | Bcdc BcdB | c4 A4 | cBAB cedc | B4 G4 | Bcdc BcdB | cdcB AcBA | G2 B,2 G4 | B4 G4 | 
 Bcdc BcdB | c4 A4 | cded cedc | B4 G4 | Bcdc BcdB | cdcB AcBA | G2 D2 G,4 ||  