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
['cAFA (3GFE (FG) cAGB Adde cAGA FEFG', 'd defg abaf gece gage defg abag']  
X:1
L:1/8
M:4/4
K:C
 |[M:2/2][K:Dmix] d | cAFA (3GFE (FG) | cAGB Adde | cAGA FEFG | fdec Adde | cAFA (3GFE (FG) | 
 cAGB Adde | cAGA FEFG | fdec Add || | d | defg abaf | gece gage | defg abag | gece ed d2 | 
 defg bged | ^cdef g2 fg | afge fdec | dcAG Adde ||  