Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
M:4/4
K:G
['B2 d2 cBAG dc B/c/d D2 z2', 'dedc cBAG'  
X:1
L:1/8
M:4/4
K:G
|: B2 d2 cBAG | dc B/c/d D2 z2 | e2 dc Bd gd | cBAG A2 z2 | B/c/d cB AGAF | G/A/BAG ED/E/ G2 | 
 dBAG EF/G/ dc | B2 A2 G2 G2 :: dedc cBAG | dedc cBAG | Bdgd edcB | cBAG A2 z2 | B/c/d cB AGAF | 
 G/F/G/A/ BG ED/E/ G2 | dBAG EF/G/ dc | B2 AG G2 G2 :|  