An oratorio is a large-scale piece of music for choir, orchestra and vocal soloists, which tells a story without staging or costumes. Most oratorios are based on stories from the Bible, a source that Handel's English audiences knew well.
Enthir is a Bosmer sorcerer and merchant found at the College of Winterhold, and has connections to the Thieves Guild in Skyrim.
This page lists the locations and effects of all of the hidden in the realm of Skyrim. are the Skyrim equivalent to Morrowind and Oblivion's Birthsign specialization. However, unlike the Birthsigns, you can swap out your standing stone bonus at any point, just find another standing stone and activate it.