Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
Q:1/4=120
M:2/2
K:C
['EGcG AGcG EGcG dDDF EGcG EGga gede', 'a/g/f/e/ cg']  
X:1
L:1/8
Q:1/4=120
M:2/2
K:C
 EGcG AGcG | EGcG dDDF | EGcG EGga | gede c/c/ c2 || g | a/g/f/e/ cg egcg | a/g/f/e/ cg eddg | 
 (a/g/f/e/) cg egde | cAGE C/C/C C2 |]  