(verb: des-KANT, dis-, noun: DES-kant)
verb intr.: 1. To talk tediously. 2. To sing or play a descant.
noun: 1. A comment on a subject. 2. An ornamental melody sung or played above a basic melody.
From Latin discantus (refrain), from dis- (apart, away) + cantus (song), from canere (to sing). Ultimately from the Indo-European root kan- (sing), which also gave us hen, chant, accent, enchant, incentive, recant, cantor, and charm.

DESCART(es) - I think therefore I am. I think therefore I am.
I think, well am I not?