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:D
['FAA GAA', 'dFF AFF', 'faa gaa']  
X:1
L:1/8
M:6/8
K:D
"^Andante" FAA GAA | FAA GFD | FAA GAA | GFD FED | FAA GAA | FAA GFE | DD/E/F/D/ EAG | EDD EDD || 
 dFF AFF | dFF GFD | dFF AFF | GFD FED | dFF AFF | dFF GFD | DD/E/F/D/ EAG | EDD EDD || faa gaa | 
 faa gfd | faa gaa | gfd fed | faa gaa | faa gfd | dd/e/f/d/ eag | edd edd ||  