Construct a musical work following the provided guidelines and thematic elements.
X:1
L:1/4
M:4/4
K:G
['B A', 'd d'  
X:1
L:1/4
M:4/4
K:G
 D | G B A/G/ F | G2 B c | d2 c B | A c B A | G G A F | G D E =C | D3"^(a)" c | B A B c | d3 B | 
 A G F E | (D E F) D | G G G E | C2 B, C | D c B A | G3 ||"^(a)" D3 d/d/ | d d d B | G B d d | 
 c B A G | (D E F) D | G/G/ G B/A/ G | E2 C C | (D c) B A | G3 ||  