Hey everyone.. i'm brushing up on my theory and wanted to check if I was doing intervals correctly. It would be great if someone could check them for me
I tried working out the interval between C and A flat (within the same octave), and I came out with an augmented sixth is this correct?
And 1 more... between B flat and F a diminished fifth? I hope i'm doing this right!

Thanks & merry xmas,
Erin xxx

Erm... I think that C to A flat is a minor sixth and B flat to F is a perfect fifth.

hey.

an interval between C and A flat is a minor 6th (i think) and the one between Bb and F is a perfect 5th. erm........... maybe you need to be 100% on the amount of semitones there are between your two notes


(i maybe wrong?!?)

jaime

The trick in these examples is to concern yourself with the first note. Consider that the major "key" of the interval you are trying to work out. Take the C-to-Aflat example.l Imagine yourself playing a C major scale. A flat is clearly not in it, but A natural is the sixth note. Since 6ths cannot be diminished, an A flat must be minor. Therefore C to A flat is a minor 6th....

It's a bit bonkers, but I hope it helps!

C - Ab: C major has no sharps or flats, so C - A would be a major 6th, the interval C - Ab is a semitone smaller so that would be a minor 6th, C - Abb is a semitone smaller again so that would be a diminished 6th. C - A# is a semitone larger than the major 6th so it would be an augmented 6th.

Bb - F: Bb major has Bb and Eb, so Bb - F is a perfect 5th, B - F would be a semitone smaller so that would be a diminished 5th and Bb - F# would be larger than a perfect 5th so it is an augmented 5th.

Hope this helps. maybe you could show how you got the augmented 6th and diminished 5th. It might be more helpful to show where you went wrong rather than what was right. PM me if you want to!

i got it now everyone, thanks for your help! =D I know where I what I did.. I was counting the semitones wrong. Thanks again for your help

Oh, and just to show what I was doing wrong... it was late at night and I for some reason thought the interval from C-A flat was a 6th plus one semitone.. rather than one less

A summary:
2nds - major eg C to D
minor eg C to Db
3rds - major eg C to E
minor eg C to Eb
4ths - Perfect eg C to F
Diminished eg C to Fb / E (same as maj 3rd)
Augmented eg C to F#
5ths - Perfect eg C to G
Diminished eg C to Gb (same as aug 4th)
Augmented eg C to G# (same as min 6th)
6ths - Major eg C to A
Minor eg C to Ab (same as aug 5th)
7ths - Major eg C to B
Minor eg C to Bb
8ths - Perfect Octave eg C to C
Diminished eg C to B (same as maj 7th)
Augmented eg C to C# (same as compund min 2nd)


Enjoy!!!

Why cant 6th be diminished?

You can get diminished 6ths - C to A double flat is a diminished 6th (see noodle's post)

Hallo.

Actually,i think this is easier but it is hard to explain it here, but i will try.

first, your have to remember by heart:

1. diminished--perfect--augmented
2. diminished--minor--major--augmented

major 2nd -2
major 3rd - 4
perfect 4th -5
perfect 5th -7
major 6th -9
major 7th -11

Then count from the keyboard: (eg. C-A flat)

C# D# F# G#(Ab)
C D E F G A
1 2 3 4 5 6 7 8 9

understand it? the intervals-9, so it is between major 6th and major 7th. but you must be confuse here. Next, you should count it fron manuscript,from middle C(in line) to Ab(on line), you will found the intervals are 6th. that's mean you can confirm it is major 6th-9.

if it is C-G#,you will count until 5 only and it reach G#(we dont count the black key), so the answer is xxx5th. the intervals you can find from keyboard(like the example above) is 8. As you see, ferfect 5th is only 7, so it should be augmented(higher a semitone). so the answer is augmented 5th.

here, you can make a conclusion.
minor 2nd -1
major 2nd -2
augmented 2nd-3 (same as minor 3rd, like C-D# is same with C-Eb)
diminished 4th -4
augmented 4th-6 (same as diminishehd 5th, like C-F sharp with Gb)
.
.
.
.
.
For diminished 6th, it can be too, like C-Abb(G). the interval is 6th from the manucript but only 7 from keyboard. major 6th-9, minor 6th-8, so diminished 6th-7.

That's all i learn from my teacher. you may find it very difficult at first but it can be very useful when you are used to it, then you can learn counting it without a real keyboard(count it in your mind). try it, maybe it will be useful to you.

Good luck!