Haha just caught up with this last week's episode. Love it! Jane Lynch and Olivia Newton-John doing the Physical video, that was fabulous! I laughed so hard I cried, that and the singing MC Hammer in the library - complete with parachute pants. Perfect!
Still think my very favorite so far was the week before last - the duet with Matthew Morrison and Kristin Chenoweth singing Barbra Streisand's medley of One less Bell to answer/A House is not a home gives me goosebumps like nothing else has.