Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:2/2
K:D
['f2 fd', 'defg a2 af b2 ba g2 ge']  
X:1
L:1/8
M:2/2
K:D
 f2 fd f2 fd | f2 fd cdeg | f2 fd gfed | cABc d3 e | f2 fd f2 fd | f2 fd cdeg | f2 fd gfed | 
 cABc defg || a2 af b2 ba | g2 ge a2 ag | f2 fa gfed | cABc defg | a2 af b2 ba | g2 ge a2 ag | 
 f2 fa gfed | cABc d3 ||  