fensonpaulcaster said:
OK..
But wait
Every scale has a different number of sharps and flats. And the C scale doesn't have any flats or sharps. I'm confused, but i think i kind of get it.
You can use me for a music teacher, although I don't think I'm qualified to be one but I'll try.
You are confusing designation of key with the 7 notes in any key. Any key has 7 notes, which are the 7 I referred to in my previous post. There is a pre-defined tonal 'distance' between each of the notes, they are either halftone or whole tone; a halftone is the tone difference from, let say, fret 1 to fret 2, whole tone is the difference between fret 1 to fret 3. In a regular scale the tonal 'distance' between the notes is as follows (the number is the note order, and the <half> or <whole> is the tonal difference:
1<whole>2<whole>3<half>4<whole>5<whole>6<whole>7<half>1
So doesn't matter where you start on the fretboard, if you play successive notes based on whole, whole, half, whole, whole, whole, half you get a scale in a certain key. If you start with a C on the fretboard and play this you get the C scale; if you start with a D and play this you get a D scale. Any scale you play this way is that scale without sharps or flats within the scale.
Now onto the sharps and flats you refer to, which has to do with the key of a piece of music.
The western music scale has the following twelve keys. Some keys have 2 names e.g. C# is the same as Db, the name used depends on the key a particular music is written. Ignore this for now. I now list the 12 keys using only plain and # designations (but remember all of the #s have alternative names like I mentioned before):
C C# D D# E F F# G G# A A# B (back to C)
There is one half tone before each of these keys; don't ask why certain key pairs, like B to C has only a half tone difference, but from C to D is a whole tone, that's the way it is defined.
Based on the list of keys above, if you are in the key of C, find the notes in the C scale. Remember I explained that the notes in a scale is w-w-h-w-w-w-h. If you do this counting along the keys lists you will find that the 7 notes in the key of C are : C D E F G A B (back to C), this require no sharp keys (in other words no flat keys either).
Now figure out the notes for the key of G. Going w-w-h-w-w-w-h on the key list starting with G you will get : G A B C D E F# (back to G). What that means is that if you write a piece of music in the key of G, note 7 has to be an F# (this is the only note that has to be sharped). When sheet music is written, the scale is written with only room to show the notes C D E F G A B (back to C). So when you want to write down a piece of music in the key of G you put a # symbol along the line (or space) where F is (happens to be the top line in the treble clef) because every F should be played as an F# in order for it be in the G scale.
If you now go through starting the scale in each of the different key notes you will see that you will get more and more notes that has to be designated to be sharped. That's
why every key has a different number of sharps and flats.
Just remember if you pick a starting note (known as root note) and play w-w-h-w-w-w-h you will be playing the scale for that key. Get on your guitar and start with G (3rd fret 6th string) and play up w-w-h-w-w-w-h and figure out what actual key notes you are playing, you will find that you would have played G A B C D E F# (back to G). The good thing about guitars is it is self-transposing, which means if you play the same fingering starting a difference spot on the neck you play the same melody but in a different key, and you never have to worry whether you have to sharp the D, sharp the F, or whatever.
One last thing, the 7, 9, 11, 13, etc. are extended chords. But that would be another discussion altogether.