tonic sol-fa Your browser does not support the audio element. [ English ] Definition A method of teaching music based upon the "movable Do" system. That is a system that chooses Do to be the tonic of whatever key is being studied, and uses solfeggio to determine the width of the intervals. Share Share on Facebook (opens in a new tab) Share on X (opens in a new tab) Last Updated: 2016-05-10 12:54:03