Beginning 5/2

Beginning 
Note quality theory notes

Today we learned yet another theory lesson about intervals. It was all about how to identify number quality when accidentals were involved. to review the previous notes go back to the blog post on 4/25.

First we did a refresher on the number quality sequence: P1 M2 M3 P4 P5 M6 M7 P8.

Then we learned about Augmented, diminished, and minor number qualities.
If a Perfect (P) or Major (M) interval is raised up 1 half step it becomes Augmented (A)
If a Perfect interval is lowered by 1 half step it becomes diminished (d)
If a Major interval is lowered 1 half step it becomes minor (m)
If a Major interval is lowered 2 half steps it then becomes diminished (d)

Example from middle C to higher C it is a P8 but from middle C to high C♭ it is d8 and from middle C♯ it is A8

Now not every time there is an accidental in an interval is is A, d, or m it really depends if the accidentals line up with the key signature. For example F major has 1 ♭ at B so if the interval is from F to B♭ it is a P4 but if it from F to B♮ then it is and A4 since B♮ is higher than B♭.

On rare occasions the lower note isn't an actual key signature like if the lower note was A♯, A♯ Major doesn't exist so what are you to do. You would move the lower note to a note that actually has a key signature like moving A♯ down to A but to keep the interval the same you need to move the top note down the same amount.
Ex. A♯ is the lower note and C is the higher note. you would move A# 1 half step down to A and move C 1 half step down to C♭. A major has 3 sharps a F, C and G since C♭ is 2 half steps down from C♯  the interval is d3