I have just uploaded my Anki deck (a flashcard deck for a memorisation program) for the Circle of fifths. It "asks" for a key, and the answer is the number of sharps/flats and the relative minor key. It shows the Wikipedia image for the circle of fifths on every answer:

Feel free to boost for reach 😁 Anki is pretty great, so even if you're not already using it, maybe you should!

/cc @amolith @emsenn

@amolith @emsenn don't need to memorise all the keys! there's a pair of rules for that, if you know the order of the sharps/flats (F C G D A E B, and the reversed for the flats):

- if the key is Xb, it has its-position-on-the-flats+1 flats. e.g.: Eb has 3 flats: b E a.
the exception of this rule is F and its relative minor DM

- if the key is X, it has all the sharps until X - 1 tone. e.g.: D has 2 sharps: f c (since c = d - 1 tone)

@jartigag @amolith @emsenn But you're talking about knowing _which_ sharps or flats there are in a key, right?

The deck doesn't have that, it's just to memorise the _number_ of sharps/flats in a key. If you want to know which exact notes are sharp/flat, you have to know and use the rules you're mentioning.

@amolith @emsenn ah i see. but what's the point of knowing how many sharps/flats has a key if you don't know which ones? 😅

@jartigag @amolith @emsenn Because you can recognise keys when you see the clef, and because they go in order so if you know the number of sharps/flats, it's easy to know which ones they actually are 😄

So you need to learn the things you mentioned in your comment if you want to make full use of the circle, yes 🙂

@amolith @emsenn aah ok, the goal is to recognize the key looking at the clef!
i usually don't count them, i apply those rules inversely (look at the last sharp or the 2 last flats). but counting will work too, of course!

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