Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
M:2/4
K:G
['dB G3 D']  
X:1
L:1/8
M:2/4
K:G
 B/A/ | GDGA | B3 B/A/ | GGBc | d3 d | ddge | d2 e/d/c | BBAA | G2 z D | GBdBge | dB G3 D | 
 BBdBge | dB G3 D | GB d2 g2 | e3 edc | B4 A2 | G4 z |]  