Notes on Prophecy of Habacuc (Author Bishop Richard Challoner (ed.))
3:1 FOR IGNORANCES: That is, for the sins of his people. In the Hebrew, it is Sigionoth: which some take to signify a musical instrument, or tune; with which this sublime prayer and canticle was to be sung.
Original Douay-Rheims from Project Gutenberg - Massive cleanup of OCR problems and editing done locally.