Where it comes from
Andy and Akiva improvise the intro on the spot and invent the jingle.
How the hosts use it
The others sing the jingle ("Seth's Corner, you're all invited... it's happening right now, take it away Seth"). Seth then recounts the sketches he wrote that week, often reading lines from them.
Why fans love it
The segment is a mock-formal talk-show feature with its own jingle, an invitation and a faux-grand host intro. Andy and Akiva say they'll finally give Seth the honest critique they were too scared to give when he was their boss ("prepare to be reamed"). In practice Seth often has no memory of what he wrote, or finds a sketch that was cut or recast, such as Smoke Alarm going to Parnell. The excerpts show it is not limited to digital shorts, since it covers whatever he wrote that week.
Written by the AI from the transcripts. Every sentence was checked against them, one by one (the full episode transcript wherever a sentence names one); 3 sentences that failed the check are left out. How the check works.