Develop a musical composition utilizing the presented motif and adhering to the required structure.
X:1
L:1/8
M:12/8
K:G
['G3 (BGB) (dBd) g3', 'd3 D3 (FDF) (AFA)'  
X:1
L:1/8
M:12/8
K:G
|: G3 (BGB) (dBd) g3 | (gfe) (dcB) (ABG) (AFD) | G3 (BGB) (dBd) g3 | (fag) (fed) (ed^c) d3 :: 
 D3 (FDF) (AFA) c3 | D3 (GDG) (BGB) d3 | D3 (FDF) (AFA) (cBA) | (Bcd) efg (cBA) G3 :|  