Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/4=112
M:2/4
K:C
['z c2 cc c2 B>A GF ED', 'B>B B2 AG A>G AF G2 F2', 'cd/c/ =B2 G2 cc/=B/ cG AG FE']  
X:1
L:1/8
Q:1/4=112
M:2/4
K:C
 z | c2 cc | c2 B>A | GF ED |{G} E2 D2 | G>G GG | G>G FG | A>G FE | D2 z :|[K:Eb] G/A/ | B2 B>B | 
 B2 AG | A>G AF | G2 F2 | B>B BB | cB AG | FF AD | E2 z2 ||[K:Cmin] G>G GG | GA =Bc | cc cd/c/ | 
{c} =B2 G2 | cc/=B/ cG | AG FE |{D} E3 D | C2 z |]  