happyfunpaul sang, um, some monstrosity about skullcrusher mountain. Called, strangely enough, "Skullcrusher Mountain", and written by Jonathan Coulton.
We had MassFILK on a cellphone, so the company (lead by Ariel Cinii) sang "Swing Low, Sweet Double-A" to them.
They wanted to serenade us as well, so we had them call Aaron's phone, and they sang "Barett's Privateers," with us coming in on the choruses.
Judith requested Mark Glasser's "'Change at Jamaica' Farewell," which he performed.
Miram requested, and Mark Glasser performed, "Charlie and the MTA"
batyatoon sang her Mornington Cresent, ttto Uffington Hill (by Talis Kimberly)
ladymondegreen sang "A Brief Summary Of Halacha As Understood By A Goy Who Hangs Around Observant Jews A Lot.", by akawil
happyfunpaul sang his own (words and music) "Fluorine Atom."
ladymondegreen and batyatoon sang "Lilo" (by Batya Wittenberg, Merav Hoffman, and Seanan McGuire) ttto "Wendy"
marapfhile sang his own "CD Boxes", also ttto "Little Boxes".
madfilkentist sang his translation of filker0's "Close Your Eyes" into German: "Mach Die Augen Zu", followed by a group performance of the same song in English for those that hadn't heard it before.