This is hands down the most useful ear training exercise I am aware of. If you can hear any interval in relationship to some Do, then you can confidently sing any melody, and if you can sing any melody and work out the technical skill, you can PLAY any melody on your instrument of choice, or figure out any melody by ear.
pitch IMITATION is important, but pitch PRODUCTION with your voice is even more important!!
![](https://s2.save4k.ru/pic/d9glE7p0KZA/maxresdefault.jpg)