Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:2/4
K:G
['B>A B>A G>G GA/B/ c>B c>B A>A', 'G2 de/d/ dc/B/ e>e e2 cc/ cB/A/']  
X:1
L:1/8
M:2/4
K:G
|: B>A B>A | G>G GA/B/ | c>B c>B | A>A AB | cd/e/ ed/c/ | Bc/d/ dc/B/ | AB/c/ BA/B/ | G>G G2 :: 
 de/d/ dc/B/ | e>e e2 | cc/ cB/A/ | d>d d2 | GA/B/ AG | Bd/e/ g>e | dc/B/ cB/A/ | G>G G2 :|  