Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
Q:1/4=90
M:2/4
K:F
['ff/f/ fa', 'F3 A/B/ c>dc>A cc/c/ cf f>gfa g3']  
X:1
L:1/8
Q:1/4=90
M:2/4
K:F
|: c | ff/f/ fa | ff/f/ fa | fgfe | G3 A | FF/F/ FA | FF/F/ Ff | A2 G2 | F3 :: A/B/ | c>dc>A | 
 cc/c/ cf | f>gfa | g3 f/g/ | a/a/a af | g/g/g gc | A2 G2 | F3 :|  