hor

1. choir
   Moja ćerka peva u školskom horu. — My daughter sings in the school choir.
   Hor je izveo nekoliko pravoslavnih pesama. — The choir performed several Orthodox chants.
2. (in ancient drama) chorus
   U grčkoj tragediji hor komentariše događaje. — In Greek tragedy the chorus comments on the events.

The chorus of a song is refren, not hor.