Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:2/4
K:C
['G cCEG cCCG cCEG dDDG cCEG cfed', 'cCC e/f/ gefd ecc(e/f/) gefe dDD(f/g/) gefd']  
X:1
L:1/8
M:2/4
K:C
 G | cCEG | cCCG | cCEG | dDDG | cCEG | cfed | c/B/A/G/ A/c/B/d/ | cCC || e/f/ | gefd | ecc(e/f/) | 
 gefe | dDD(f/g/) | gefd | ecfd | c/B/A/G/ A/c/B/d/ | cCC |]  