Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
Q:1/4=120
M:2/2
K:C
['c2 C2 E2 G2 c2 c>c c3', 'G2 (G/A/B/c/) d2 d>d d2 c>d e2']  
X:1
L:1/8
Q:1/4=120
M:2/2
K:C
 GA/B/ | c2 C2 E2 G2 | c2 c>c c3 e | d2 G>f e2 G>f | egfe dGAB | c2 C2 E2 G2 | c2 c>c c3 e | 
 d3 g f>ag>f | g2 G>G G2 :: (G/A/B/c/) d2 d>d d2 c>d | e2 e>e e2 c>B | A2 B>c dcBA | G2 E>E E2 G2 | 
 AEcA BEdB | cEdB cEfd | (3ega (3fed c2 B2 | A2 A>A A2 GA/B/ | c2 C>c c2 cd/e/ | d2 D>D D2 z2 | 
 de/f/ | ecdB cAdc | B2 G>G G2 E2 | FAdc BAGF | EGcB AGFE | (3DcB (3AGF E2 D2 | C2 C>C C2 :|  