Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/16
M:2/4
K:F
['f2{g}fe f<c({d}', 'AFcF dFcF']  
X:1
L:1/16
M:2/4
K:F
|: f2{g}fe f<c({d} cB) | AFcF dFcF | f2{g}fe f<c({d} dB) | ABGB AFF z :: AFcF dFcF | AFcF AGGB | 
 AFcF dFcF | ABGB AFF z :|  