Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:2/4
K:C
['cc c/G/E/G/ AA A2 BB B/G/A/B/', 'c2 e2 d>G AF F2 d2 B>G']  
X:1
L:1/8
M:2/4
K:C
|: cc c/G/E/G/ | AA A2 | BB B/G/A/B/ | c>e G2 | cc c/G/E/G/ | AA A2 | BB B/G/A/B/ | c/B/c/d/ c2 :: 
 e2 d>G | AF F2 | d2 B>G | AE E2 | A2 G>E | FA d2 | BGAB | c/B/c/d/ c2 :|  