(Buffy the Vampire Slayer)
On a live episode of This American Life, Joss Whedon played the piano and sang a song from Commentary! The Musical.
(Dr. Horrible's Sing-Along Blog)
(Buffy the Vampire Slayer, The Avengers, Dollhouse, Firefly)
(Cabin in the Woods)
A parody of "Like a Boss" about Joss Whedon. Contains some strong language.