Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:6/8
K:F
['ABG F3- F2 G A2']  
X:1
L:1/8
M:6/8
K:F
 f |"F" c2 B"C7" ABG |"Dm" F3- F2 G |"F" A2 B"Dm" cdA |"Am" c3- c2 f |"Am" cdB"C7" ABG | 
"Dm" F3- F2 G | A2 d"Am" dec |"Dm" d3- d2 |: c |"F" A2 f fge | f3- f2 c |"Dm" A2 c cdA | 
"F" c3- c2 f |"F" dcB"C" ABG |"Dm" F3- F2 G | A2 d"Am" dec |"Dm" d3- d2 :|  