בְּעִדָּנָ֡א דִּֽי־תִשְׁמְע֡וּן קָ֣ל קַרְנָ֣א מַ֠שְׁרוֹקִיתָא קיתרוס [קַתְר֨וֹס] סַבְּכָ֤א פְּסַנְתֵּרִין֙ סוּמְפֹּ֣נְיָ֔ה וְכֹ֖ל זְנֵ֣י זְמָרָ֑א תִּפְּל֤וּן וְתִסְגְּדוּן֙ לְצֶ֣לֶם דַּהֲבָ֔א דִּ֥י הֲקֵ֖ים נְבוּכַדְנֶצַּ֥ר מַלְכָּֽא׃
that at what time ye hear the sound of the horn, pipe, harp, trigon, psaltery, bagpipe, and all kinds of music, ye fall down and worship the golden image that Nebuchadnezzar the king hath set up;
Read kabbalistic (mystical) interpretation of Daniel 3:5: and classical mystical sources.