The Free Dictionary definition of sonorous:
son·o·rous (snr-s, s-n?r-, -nr-)adj.1. Having or producing sound.2. Having or producing a full, deep, or rich sound.3. Impressive in style of speech: a sonorous oration.4. also (snr-s) Produced in the manner of a sonorant.[From Latin sonrus, from sonor, sound, from sonre, to sound; see swen- in Indo-European roots.]

The April 1st Elder Scrolls Online definition of sonorous:
http://elderscrollsonline.com/en/news/post/2013/04/01/loremasters-bedtime-tales-vol-i

April Fool or not I think there should be more of that guy

I do kinda want to see him do more lore-based videos, but he's probably pretty freaking busy.

I either don't get this or the link is broken. All I see is sign-ups for the beta.