Create a composition based on the provided motif while adhering to the necessary musical structure.
X:1
L:1/8
Q:1/8=120
M:2/4
K:G
['GB de/f/ gf f/e/d DF', 'bd bd b2 b/a/g ad'  
X:1
L:1/8
Q:1/8=120
M:2/4
K:G
"^polka" GB de/f/ | gf f/e/d | DF AB | cB B/A/G | GB de/f/ | gf f/e/d | DF A>B | GG G2 :| bd bd | 
 b2 b/a/g | ad ad | a2 a/g/f | bd bd | b2 b/a/g | ad f>a | gg g2 :|  