Why are these Swedish students singing a Hanukkah song?

On December 13th. during Saint Lucy's Day, the students sing Christmas carols but also devote one of the songs to the Jewish students and to Hanukkah.

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Sweden ,Stockholm ,Swedish ,Maoz Tzur ,Judiska Ungdomsf , ,Saint Lucy ,Diocletianic Persecution ,Vasa Real ,Sait Lucy ,