Develop a musical composition that aligns with the given structural outline and thematic content.
X:1
L:1/8
Q:1/2=100
M:4/4
K:G
['g2 dB', 'g2 ge'  
X:1
L:1/8
Q:1/2=100
M:4/4
K:G
 G2 Bd g2 dB | g2 dB cA A2 | G2 Bd g2 dB | cedc BG G2 :: g2 ge a2 af | g2 ge be e2 | gage abaf | 
 gedc BG G2 :|  