Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
M:4/4
K:G
['BG G2 BGcA BG (3Bcd gded BGcA', 'A Bdd^c dedc'  
X:1
L:1/8
M:4/4
K:G
|: BG G2 BGcA | BG (3Bcd gded | BGcA BGGB | A=FAB cBAG | BG G2 BGcA | BG (3Bcd gded | BGcA BGGB | 
 A=FAB c3 A :: Bdd^c dedc | (3Bcd de gded | Bdd^c dedB | A=FAB c3 A | Bdd^c dedc | Bdde g2 de | 
 gbeg dgdB | A=FAB cBAG :|  