This video tutorial is in the Music & Instruments category which will show you how to sing octave and unison. Unison singing is two or more people singing on the same note. The singing has to be in sync. It is important to make sure that the phrasing and the lines are together. Also the tones should be identical. One should not be too loud or overbearing. Octave singing is like unison singing except for the fact that one person will be above or below the other person in terms of tones and notes. Everything else is the same melody with a higher and a lower pitch.