When constructing an interval, e.g. a major third from A I work like this:
- Count three notes including the starting one, so A, B, C
- Now check on the circle of fifths whether A major scale has an accidental on C(it has a #)
- If it has I add the accidental to the last note - therefore I get C#
Is this the right? I run into problems when constructing an interval from a note which doesn't have a major scale, e.g. creating a major third from G#. I get to B but how do I check for accidentals then? Should I somehow utilize the minor scales? If I should then with scales which have both major and minor version which one should I use and when. Thanks for the advice.