Determining key from sig

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[grathan]

Its been a while. In a treble clef don't ya take the last sharp of the signature and move it up half a step to get the key or something like that ? Also what about flats..

[Iliace Vladimirovich]

Sharps - half step up from last sharp.

Flats - go up a fifth or down a fourth, from last flat.  EDIT 11/28/2007: Or more simply, 2nd to last flat is the tonic.

Both result in the root of the major key, so if it's a parallel minor you'd go down m3 from that.

[grathan]

Cool, thanks bud. 

[armada1]

crap Illace that works ........    Learn something everyday!!!!

[300m]

Sharps - half step up from last sharp.

Flats - go up a fifth or down a fourth, from last flat.

Both result in the root of the major key, so if it's a parallel minor you'd go down m3 from that.

ilia, can you give a flat example??  having a case of the stupids this AM.  under stand the sharps.  Pictures

[Iliace Vladimirovich]

Sure... take a look at the circle of fifths, except in reverse:

 C#  F#  B  E  A  D  G  C  F  Bb  Eb  Ab  Db  Gb  Cb
                           Bb Bb  Bb  Bb  Bb  Bb  Bb
                              Eb  Eb  Eb  Eb  Eb  Eb
                                  Ab  Ab  Ab  Ab  Ab
                                      Db  Db  Db  Db
                                          Gb  Gb  Gb
                                              Cb  Cb
                                                  Fb


The top line is the circle, below it are the corresponding key signatures.  Two relationships you see: (1) the second-to-last flat corresponds to the major scale root; and (2) the last flat is always a P5 below the major scale root (this is the example).

So, if your last flat is Ab in the key signature, you go up a P5 (7 semitones) to find out that Eb is the root of the major scale that has this key signature.  If you wanted to find the relative minor, you go an m3 down from there: Cmin.

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