https://www.musical-u.com/learn/ultimate-guide-to-interval-ear-training/
Musicians are often told they should “learn intervals”. We are told this by our instrument teacher to help us pass exams, by course professors at music college, by ear training tools and websites…
But why? What is so important about intervals – and if you do want to learn them, how exactly do you do interval ear training?
https://www.musical-u.com/learn/ultimate-guide-to-interval-ear-training/