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:F
['F>GAB cAfd', '[FCA,] c a>[bg]af gedc d>efA G/F/G/A/ GA']  
X:1
L:1/8
M:4/4
K:F
 C | F>GAB cAfd | cAFA G/F/G/A/ GA | F>GAB cAfd | cAGA [FCA,]2 [FCA,] |] c | a>[bg]af gedc | 
 d>efA G/F/G/A/ GA | F>GAB cAfd | cAGA [FCA,]2 [FCA,] |]  