Construct a musical work following the provided guidelines and thematic elements.
X:1
L:1/8
M:4/4
K:G
['B<d d2', 'bbaa g2 d2'  
X:1
L:1/8
M:4/4
K:G
 G>GG>G B<d d2 | c>cB>B A>DED | G2 G>G B<d d2 | e>fg>a g4 || bbaa g2 d2 | efge dB [DA]2 | 
 bbaa g2 d2 | efga g4 ||  