Compose a piece of music based on the provided motif and adhering to the outlined musical structure.
X:1
L:1/8
M:2/4
K:G
['dB/d/ cA/c/ BG G/F/G/B/ AF F/E/F/G/', 'GB/d/ g>f fe'  
X:1
L:1/8
M:2/4
K:G
 B/c/ | dB/d/ cA/c/ | BG G/F/G/B/ | AF F/E/F/G/ | AG GB/c/ | dB/d/ cA/c/ | BG G/F/G/B/ | 
 AF F/E/F/G/ | AG G :: (3D/E/F/ | GB/d/ g>f | fe e/d/e | DF/A/ f>e | ed d/c/d | GB/d/ g>f | 
 fe e>g | fa ef | gG G :|  