Eagle
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It’s really only a discussion about naming conventions. If you’re a beginner ( to theory) it’s useful have an abstract interval name from the major scale as reference but when you’re using it and properly immersed the space between two notes will be obvious and known just by the name of the notes. If you’re talking about an interval in a piece of music you describe it by its function and if you need to describe the distance between two abstract notes then the major scale is the descriptor. It’s really that simple. Nobody is saying an interval doesn’t exist in isolation but classical music theory doesn’t need to assume major scale functions if you already know what notes don’t have a sharp. It’s literally useless information that in context is often unhelpful because it is out of context and already in the notation or known. The only technically correct way to describe it is in semitones/tone because this doesn’t apply major scale functions and keeps it abstract and separate from such.