The extra furthest back in the row is just looking directly into the camera, ignoring all direction and just emoting as hard as he can.

(Kidding, I enjoy Daft Punk!)

It is canon in the Daft Punk Cinematic Universe that Mozart was an alien, so Beethoven being one is not out of line, and they could be blending in with his planet.

Meatwad: Batch? Beetoven? Are they down with the Pee Pants?