This House M.D. photo contains
tympanist, timpanist, business suit, and drummer.
There might also be
dress suit, full dress, tailcoat, tail coat, tails, white tie, and white tie and tails.
Here's an interview Robert Sean Leonard did with TV Guide where he talks about Anne Dudek leaving House and what he thought of having so many new doctors on the show last season. He even gives some funny predictions about the new season.