The vocals in a track are the most important element as they tell the story in the song.
Having this element mixed in a way to sound clear, present and impactful is of absolute importance to the overall success of the track.
A common mistake made by producers when mixing in vocals is not layering them. Layering vocals helps to give them a fuller and more complex sound.
In this screencast, I'll show you how to layer vocals in Ableton 10.