Motokuni is my best friend.

Kunimitsu is my best friend.

He was deeply involved in the politics of the republic.

His new game is very popular in the netizen community.

The culture of Russia (obsolete term) is very interesting.

His country was under the influence of the suzerain for a long time.

He is an expert in musicology.

This room is covered with soundproofing material, so the sound doesn't leak outside.

He honked the car horn to get my attention.

The treble clef is often used in musical scores.