Man muss genau hinhören, um die Zwischentöne zu verstehen.

You have to listen closely to understand the nuances.

Man muss ganz genau hinhören, um die Nuancen der Musik zu verstehen.

One has to listen very closely to understand the nuances of the music.

Wenn Kinder leise sind, sollte man erst recht hinhören.

When children are quiet, you should listen even more carefully.