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I just started playing piano, but Im confused about reading key signatures. For example take a look at the first measure of this song: http://www.musicnotes.com/sheetmusic/mtd.asp?ppn=MN0130187, does this measure indicate to just play c over and over again. I know this song uses minor and major keys, but how would you know when to play them by looking at sheet music

  • I suspect you are confusing Chord Symbols with Key Signatures. – Laurence Payne Sep 5 '16 at 16:15
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It is difficult to tell from the key signature alone if a song is in a major or minor key because the key signature is the same for a major key and the corresponding "relative minor". The difference is which note forms the tonal center - which is the root note. A major key and the relative minor key will have the exact same notes, but the intervals from the root note will vary depending on if it's major or minor.

For more information on how to determine if a song is in a major or minor key see this: Major or Minor Key?

In the sheet music you linked the first several measures only have notes on the bass staff (with bass clef) and the note is not a C but an E flat (because of the E flat in the key signature). The first notes played on the treble staff (right hand) are a D (all D notes in the first measure with notes on the treble clef).

From the key signature we know that the key is either B flat major or G minor because of the two flats in the key signature. Sometimes a song will shift from a major key to the relative minor key, but it is not as common as a song remaining in the same key. But the notes are exactly the same in both the major key indicated by the key signature and the relative minor indicated by the same key signature.

There are many charts available on line which will tell you what the key signatures mean. The chart pictured below was found here: Piano-Keyboard-Guide.com

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A bit of a red herring! The 'N.C.' at the start means 'no chord'!! Then the rest of the sheet music tells which chords to play, just as most sheet music like this does. The majors and minor chords are apparent in the boxes over the stave. I wonder whether you mean major and minor chords rather than keys. As Rockin' states, the key sig. gives a clue as to either one major or one minor (its relative) key. However, the notes used are virtually all the same, as denoted by the key sig.

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    Plus one for figuring out that OP may have seen the C in "N C" (for no chord) and assumed it meant play a C chord. I thought he/she might have been looking at the note in the Bass staff and mistaking it for a C but your theory is just as plausible. OP plays piano so I never thought he/she might be looking at the guitar chord notation. – Rockin Cowboy Dec 23 '15 at 13:31
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The easiest way to discern the tonality of the piece would be to look at the note that is the leading tone of the relative minor and see if it is raised or not.

So for instance if the key signature tells you G major look at the D's in the passage and see if it is raised. If you see a D# then it clearly indicates e minor.

Also you should be doing aural training. This will help you to hear pieces in both the Major and minor tonalities so you can hear the difference between the two.

  • There are many occasions when the D is not sharpened in E minor. If the piece is written especially in harmonic minor, then yes. If in natural minor, then no. If in melodic minor, yes and no. Last chord make-up is a better bet. – Tim Dec 22 '15 at 16:42
  • @Tim what's more, in a chromatic G-major piece, or one that modulates around a bit, or has a section that sits in the relative minor, you can also find sharpened Ds. – phoog Dec 22 '15 at 19:11

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