Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
M:4/4
K:G
['BGBd gfga bgdB c3 d', 'bgaf gbaf gdBd c3 d'  
X:1
L:1/8
M:4/4
K:G
|: (3DEF | GFGA BGBd | gfga bgdB | c3 d edcB | Aa^ga fdcA | G3 A BGBd | gfga bgdB | c3 d egfg | 
 ecAF G2 :: Bd | g3 a bgaf | gbaf gdBd | c3 d edcB | Aa^ga fdef | g2 ga bgaf | gbaf gdBd | 
 c3 d egfg | ecAF G2 :|  