Craft a musical piece in accordance with the designated structure and theme.
X:1
L:1/8
M:4/4
K:G
['B2 BA GABd A3 G FGAF', 'B2 BA'  
X:1
L:1/8
M:4/4
K:G
|: B2 BA GABd | A3 G FGAF | GDAD BDAG | Fded cdBA | B2 BA GABd | A3 G FGAF | GEAE BEAG | FDEF E4 :: 
 B2 BA Bdgb | a3 g fg/f/ed | cddd Bddd | AdGd FABc | B2 BA GABd | A3 G FGAF | GEAE BEAG | 
 FDEF E4 :|  