How to play a note that is flat in the key signature and flattened again as an a

Question:

How to play a note that is flat in the key signature and flattened again as an accidental?

If for example A is flattened in the key signature and flattened again as an accidental in one measure do you play a G?

Best Answer - Chosen by Asker: A true "double flat" would be two flat signs. What you are seeing is either following a natural in the measure, or what is called a "courtesy accidental" which occurs after a natural occurs in a previous measure. (Remember, the bar line cancels all accidentals.)

The reason for double flats and double sharps has to do with theory. Yes, in practice "a double flat" is the same ("enharmonic") as "g natural", but in theory they are very different. As you learn music theory you will understand!