The right of hearing is to keep it pure from listening to backbiting (ghiba) and listening to that to which it is unlawful to listen.

وَأَمَّا حَقُّ السَّمْعِ فَتَنْزِيهُهُ عَنْ سَماع الغيبةِ و سَماعِها لا يحِلّ سَماعه.