I think they adopted Corinthian order, for this type of orders can be seen on many cathedrals around Europe including those in France, Malta (Valletta), etc.
<span>A key signature is most helpful in determining the "root and the scale used" a piece of music. Other purpose of key signature is that it tells you what key to play in order to avoid accidentals. Accidentals are symbols that modifies the pitch of the note, either making it into a sharp, a flat.</span>
There are four steps;
look at the obvious
analyze the artwork
decide on an interpretation
make a judgment
