Key Signature Drill — Circle of 5ths Quiz Worksheet PDF
Quiz yourself on all 15 key signatures (0–7 sharps and 0–7 flats), naming the major and relative minor key plus the sharp / flat letters in order. Free printable theory worksheet.
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Father Charles Goes Down And Ends Battle — 7 letters that unlock 15 keys
Key signatures are the most-tested topic in music theory exams and the most-feared by beginning sight-readers. The fear is unwarranted: the entire system runs on two mnemonic sentences for the order of accidentals — sharps go *F C G D A E B* ("Father Charles Goes Down And Ends Battle") and flats are the same letters reversed: *B E A D G C F*.
Once those 7 letters are memorized, every key signature follows from two rules: last sharp = leading tone of the major key (so 4 sharps last sharp is D♯ → key is E major), and second-to-last flat = name of the major key (so 4 flats second-to-last is A♭ → key is A♭ major). The drill on this page rehearses both rules, plus the relative minor (down a minor 3rd / 3 half-steps) for every key.
Going around the circle of 5ths in both directions builds the modulation intuition you need for chord-substitution and improvisation: G major → D major adds one sharp, F major → B♭ major adds one flat. The visual pattern is symmetric, but it only feels symmetric after 50 repetitions.
Pair with the Scales Reference Chart so the signature *predicts* the scale, and the Note Identification Worksheet so accidentals from the signature stop tripping up sight-reading.