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Could someone help me explain this music sheet of Frere Jacque?

The is a Violin key, A mole on the A line and some notes. What do I habe to do with them in order to play this the correct way according to how it is specifically written on the picture 🤷‍♂️

  • Apart from the barlines missing and the flat (and lower 4, but that hardly matters) lower than it should be, I don't see anything wrong with it, and certainly not anything complicated about it either. If you know the basics of reading sheet music, you shouldn't have any trouble at all.
    – Divizna
    Feb 19 at 23:05
  • Is this a question about how to read music, or how to play the violin? Or are you confused by some detail in particular? Feb 20 at 2:29

1 Answer 1


First, some English-language music terminology:

  • violin key -> treble clef
  • mole -> flat
  • A line -> A space

So it is a treble clef with a flat on the A space. That is a mistake. If a key signature has a single flat symbol, it is always on B. Such a key signature indicates either F major or D minor*, and we can see that the notes are those for Frère Jacques in F major. Thus we can conclude that the placement of the flat symbol is erroneous.

Also, the last note should be a half note (also known as a minim) rather than a quarter note (a.k.a crotchet).

* Exceptions are possible, but they are beyond the scope of the basic music theory needed to identify this error.

  • 'If a key signature has a single flat symbol, it is always on B'. Normally, and should be, true! I used to work with a band where the sharps/flats were any old where. it didn't really matter, as for example, 3# must indicate A, and we all know which those # are, I hope!
    – Tim
    Feb 20 at 10:41
  • @Tim maybe one of your old band mates produced the notation in this question!
    – phoog
    Feb 20 at 15:02
  • @phoog Or maybe they studied #10 from the first book of Bartók's Mikrokosmos :-) Feb 21 at 4:36

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