Music Theory : Lesson 3

Three lesson in one night. Now we come to key signature. In previous lesson, we talk about how to build major and minor scale using pattern. And this needs accidentals (sharp and flat). We will now put this accidentals when building the major minor scale to the left side of the staff. Example is below. The top part is where you use accidentals everywhere. Since you need to repeat it anyway, we just put that accidentals near the treble clef which looks like the bottom part.
In the above example, we can see 5 flats. It must be arranged that way.

The full arrangement that needs to be followed are below:
In the above picture, the first Cmajor/aminor has no sharp/flats. The second is Gmajor/eminor which has 1 sharp at F. At C#major/a#minor, there's 7 sharps and make sure it is written that way. Cmajor/aminor to Gmajor/eminor, the difference is 5 pitch.

Numbers of key can be summarized as below:

At the bottom of circle, 6 scales are overlap. 2 overlap scales for example are Bmajor/g#minor
overlap with Cbmajor/abminor.

Unfortunately, this need to be remember.

I hope no confusion. If there is, head here: http://www.smu.edu/totw/keys.htm