Oh, it is performance. But I'd really rather not have the most important part of it be how high the player rolls on a d20 always using the same base number. I'd far rather a skill challenge using:
Skills like that allow you to actively craft the performance and reflect what you are doing. Much more evocative than perform/perform/perform/perform. Especially if it comes down to a single die roll.
- Diplomacy - pick a performance tailored to the target audience
- Bluff - how believable can you make your story
- Intimidate - make them laugh, make them cry, make them scared
- Insight - notice when to change the pace or when they are getting bored
- Endurance - whatever the performance is, it is epic. And physically demanding.
- Secondary: History/Streetwise/Arcana/Religion/Nature/Dungeoneering - fill in details to draw people in
In most cases, the form of the performance is set so Diplomacy's role is usually not available (Blatant Beast demands a story it hasn't heard before, the devil come to you with a take it ot leave it challenge against your best skill, etc.). There are a few stories where the protagonist offers the challenge, but they are more rare.
Bluff, Intimidate, and Insight might be appropriate, but they don't matter unless you have sufficient (read very high) skill at the base task. Intimidate Death all you want, if you can't match its chess-playing skill, you are going with it right now.
Playing chess against Death may be epic, but it is hardly fatiguing with its pair of moves then break to think.