Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
Q:3/8=72
M:3/8
K:G
['c2 c cBc d B2 dcB d', 'cBA GEF GAB A']  
X:1
L:1/8
Q:3/8=72
M:3/8
K:G
 G>AB | cBA | G>AB | cBA | G3 | A z2 | A>AA | GFE | D>AA | GFE | D2 G | G z2 |[K:C] c2 c | cBc | 
 d B2 | dcB | d c2 | z3 | c2 c | cBc | d B2 | dcB | d c2 |: cBA | GEF | GAB | A G2 :|  