A descant, discant, or discantus is any of several different things in music, depending on the period in question; etymologically, the word means a voice above or removed from others. The Harvard Dictionary of Music states: Anglicized form of L. discantus and a variant of discant.

What is Discantus Genshin?

An ornamental melody or counterpoint sung or played above a theme. b.

What is Discant style?

descant, also spelled discant, (from Latin discantus, “song apart”), countermelody either composed or improvised above a familiar melody. ... In late medieval music, discantus referred to a particular style of organum featuring one or more countermelodies added to a newly rhythmicized plainsong melody.