I’m constantly amazed at how many beginning and even intermediate musicians don’t realize that the flats in any key signature always proceed in the same order: BEADGCF. Once they grasp that, the light bulb comes on in their mind and key signatures make sense to them. (By the way — don’t confuse flats in the key signatures with accidentals — they are different animals!)

Please watch this short video and you will forever know the order of the flats (if you don’t already):

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