Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:C
['gd ecdB', 'e2 dGBG', 'e2 dgBg GgBg', 'dG c/B/A/G/']  
X:1
L:1/8
M:4/4
K:C
 de/f/ gd ecdB | AffA c2 e2 | e/f/ gd ecdB | dggB d2 e2 :| dGBG dGBG | AffA c2 e2 | 
 dGBG g/f/e/d/ BG | dggB d2 e2 :| dgBg GgBg | AffA c2 e2 | dgBg GgBg | dggB d2 e2 :| 
 dG c/B/A/G/ dG c/B/A/G/ | AffA c2 e2 | dG c/B/A/G/ g/f/e/d/ BG | dggB d2 e2 :|  