An easy way to remember the various Intervals:
Yes, that's somewhat helpful, though my problem with this is more with identifying the interval between two notes on sight, especially when it requires a certain "calculation" given the half-steps that are thrown into the Western scale.
And especially when the position of the whole scale in chant can be shifted by the clef indicating a different "Do" (or, sometimes, "Fa") line. I can't do that automatically, it requires too much thinking for me. Friends who are into music have tried to explain to me how the current notation is "just as easy"...but, honestly, writing it just as a chromatic 12 tone all-half-step scale with no accidentals would make a lot more sense for me and be lot easier to my mind for sight reading. Or even just (at least with monophony) a list of "pre-calculated" intervals, like, "M4, m3, P4" or whatever.
I know there are..."things," for lack of a better word...that can be demonstrated or figured out musically using the major scale as the basis for notation, but I think for the common man...it's rather mystifying and arbitrary and inconsistent seeming. And people who are "in music" dont seem to understand that. To me, it is very intuitively confusing (no matter how much I know the theory behind it), that from a space to a line can be a whole step in one place but a half-step in another. That the same interval visually can represent different intervals audibly.
Of course, chant is a little bit different because it only has one accidental, so the "do-re-mi" scale is a bit easier to use without having to think too much about it...but...the fact that it can shift up and down on the lines somewhat cancels out the ease of that.